Update register/submit/pw-change for screenreaders

The three important files, next/{register,submit,pw-change}.{md,html}
no longer have images in them (besides the logo at the top of the image
which has nothing to do with registering, submitting or changing
passwords); instead the text in the images are actual text (in some
cases, just the relevant parts and in others all or almost all).

The png/register.* and png/submit.* images were removed.

next/submit.html

@@ -433,11 +433,7 @@ is only ready for submissions
 <a href="https://submit.ioccc.org">IOCCC submit server</a>
 might be offline and unreachable as a website.</p>
 <p>To login, open <a href="https://submit.ioccc.org">https://submit.ioccc.org</a>
-in your browser. Fill in your login credentials and click “Login”.
-It might look something like:</p>
-<p><img src="../png/submit.login.png"
- alt="submit server login page screenshot"
- width=710 height=344></p>
+in your browser. Fill in your login credentials and click “Login”.</p>
 <p><strong>NOTE</strong>: if the contest is NOT open you will see something like this instead:</p>
 <blockquote>
 <p>The contest is NOT yet open for submissions.<br>
@@ -452,22 +448,48 @@ details. After that you will have to log back in.</p>
 <p>Once you’ve logged in, you will see submit slots. Each slot is for one
 submission so if you update a submission, make sure you choose the right one so
 you do not replace the wrong one!</p>
-<p>Here is what it looks like without any uploads and no slot selected:</p>
-<p><img src="../png/submit.slots.png"
- alt="submit server submission slots list to select from with no slot selected
- screenshot" width=710 height=806></p>
-<p>Select a slot and then select a file by clicking the button “Choose File”. After
-doing this, it should look something like:</p>
-<p><img src="../png/submit.slot-file.png"
- alt="submit server submission slot selected with a file chosen to be uploaded screenshot"
- width=717 height=865></p>
-<p>If you need to change the file to upload, you can mouseover the file and click
-it. If you wait a moment it’ll show the current filename.</p>
+<p>It will show text and radio buttons for each row (up to 10 numbered <code>0</code> through
+<code>9</code>):</p>
+<table>
+<thead>
+<tr>
+<th>Select</th>
+<th>Slot Information</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>0: [N]</td>
+<td>Status: slot empty</td>
+</tr>
+</tbody>
+</table>
+<p>The <code>[N]</code> is a radio button. Tick that to select that slot. Then further down
+the page you’ll see the text along the lines of:</p>
+<blockquote>
+<p>IMPORTANT: Upload only XZ compressed tarballs whose filename is:</p>
+<p><code>submit.7ec754d4-8670-421a-a1b6-7dd3dc5f215e-SLOT.TIMESTAMP.txz</code></p>
+<p>where <code>SLOT</code> is a slot number, and <code>TIMESTAMP</code> is the build time as a <a href="https://unixtime.org/">Unix
+timestamp</a>.</p>
+<p>We highly recommend that you use <code>mkiocccentry(1)</code> to create your submit file as
+it must pass the <code>txzchk(1)</code> sanity checks, and when the uncompressed tarball is
+untarred, the resulting directory must pass <code>chkentry(1)</code>.</p>
+</blockquote>
+<p><strong>NOTE</strong>: the <code>7ec754d4-8670-421a-a1b6-7dd3dc5f215e</code> is your UUID. <strong>MAKE SURE
+YOU CHANGE IT TO YOUR UUID</strong>!</p>
+<p><strong>NOTE</strong>: the <code>SLOT</code> and <code>TIMESTAMP</code> <strong>in the filename</strong> are generated based on
+your input in <code>mkiocccentry(1)</code>.</p>
+<p>Now select the slot you need and then scroll down and click the link that says:
+<code>Choose File</code>. A file select option in your browser should open up. Browse for
+your <strong>XZ compressed tarball</strong> that was <strong>generated by <code>mkiocccentry(1)</code></strong> and
+then click whatever button your browser has to upload the file.</p>
+<p>You can see the filename of your **XZ compressed tarball<code>that was **generated by</code>mkiocccentry(1)<code>**  you're about to upload if you mouseover it and wait a moment; if you have made a mistake in your file selection, you may click the link that says</code>Choose File` again. Fix your mistake by choosing the correct
+file in the file selection pop-up in your browser.</p>
 <p>Once you’re certain you have selected the correct file, click “Submit”, below
 the file selection step.</p>
 <p>When it’s uploaded it should say something like:</p>
 <blockquote>
-<p>• Uploaded file: submit.9971ada4-b6ae-427d-a7ec-e67a30362cdb-0.1740838915.txz</p>
+<p>• Uploaded file: <code>submit.9971ada4-b6ae-427d-a7ec-e67a30362cdb-0.1740838915.txz</code></p>
 </blockquote>
 <p>And in the slot it will give you important details like:</p>
 <ul>
@@ -480,6 +502,9 @@ tarball listing).</li>
 <li>the upload date.</li>
 <li>the SHA256 hash of the file.</li>
 </ul>
+<p>Again the <code>7ec754d4-8670-421a-a1b6-7dd3dc5f215e</code> is your UUID, the <code>SLOT</code> is the
+slot number and <code>TIMESTAMP</code> is the build time as a <a href="https://unixtime.org/">Unix
+timestamp</a>.</p>
 <p>Now if you’re done, log out.</p>
 <p>If, on the other hand,, you upload a file that is too big you will see something
 like:</p>
@@ -499,27 +524,27 @@ then you <strong>MUST</strong> upload a properly named XZ compressed tarball, <s
 package it with <code>mkiocccentry</code>!</p>
 <p>If later on you log in and see something like:</p>
 <blockquote>
-<p>Status: server slot error code: 1! Use mkiocccentry to rebuild and resubmit to
-this slot.</p>
+<p><strong>Status: server slot error code: 1! Use mkiocccentry to rebuild and resubmit to
+this slot.</strong></p>
 </blockquote>
 <p>or:</p>
 <blockquote>
-<p>Status: submit file failed the txzchk test! Use mkiocccentry to rebuild and resubmit to this slot.</p>
+<p><strong>Status: submit file failed the txzchk test! Use mkiocccentry to rebuild and resubmit to this slot.</strong></p>
 </blockquote>
-<p>… or <strong>ANY</strong> other error then you <strong>MUST FIX</strong> your submission, repackage your
+<p>… or <strong>ANY OTHER ERROR</strong> then you <strong>MUST FIX</strong> your submission, repackage your
 tarball with <code>mkiocccentry</code> and upload to the same slot again! If you do not fix
-this your submission <strong>WILL</strong> be rejected for violating <a href="rules.html#rule17">Rule
+this your submission <strong>WILL BE REJECTED</strong> for violating <a href="rules.html#rule17">Rule
 17</a>!</p>
 <p>After the submission deadline is reached, you can log in to check the status of
 your submissions. This is what it will say when the judges have verified
 that your tarball / submission has been validated (NOT judged), by <code>txzchk(1)</code>
 and <code>chkentry(1)</code>:</p>
 <blockquote>
-<p>Status: the format of this submission has been validated.</p>
+<p><strong>Status: the format of this submission has been validated.</strong></p>
 </blockquote>
 <p><strong>IMPORTANT</strong>: this does <strong>NOT</strong> mean that your submission does not violate the
 rules or that everything is OK once the tarball is extracted; it simply means
-the tests performed by the tools passed. If you find a flaw in the tool and
+the tests performed by the tools passed. If you find a flaw in a tool and
 abuse it and the tests pass then you stand a significant chance of having your
 submission rejected for violating <a href="rules.html#rule17">Rule 17</a>, even if the
 tests passed.</p>