Update pw-change.html, register.html, submit.html

Some images are no longer used but they still exist here for the time
being. Text is used instead though based on some discussion text might
have to change.

Adjusted alt text of some images a bit.

A more thorough look at the way these updates look must still be done.

next/submit.html

@@ -436,12 +436,16 @@ might be offline and unreachable as a website.</p>
 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"
+ alt="submit server login page screenshot"
  width=710 height=344></p>
-<p><strong>NOTE</strong>: if the contest is NOT open you will see something like this instead:
-<img src="../png/submit.contest-closed.png"
- alt="submit server contest closed"
- width=710 height=806></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>
+Sorry (tm Canada 🇨), the IOCCC is not yet open.<br>
+The IOCCC is scheduled to open at 2025-03-05 23:19:17.131107 UTC.<br></p>
+<p>Message(s):<br>
+The IOCCC is not yet open for submissions.</p>
+</blockquote>
 <p>Assuming it is open, and if you’ve not logged in before, you’ll have to change
 your password first. See the file <a href="pw-change.html">pw-change.html</a> for more
 details. After that you will have to log back in.</p>
@@ -450,44 +454,75 @@ 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 slots"
- width=710 height=806></p>
+ 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 slot and file selected"
+ 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. It will look something
-like this:</p>
-<p><img src="../png/submit.change-file.png"
- alt="submit server change file"
- width=717 height=865></p>
+it. If you wait a moment it’ll show the current filename.</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 look something like this:</p>
-<p><img src="../png/submit.submission-uploaded.png"
- alt="submit server submission uploaded"
- width=717 height=525></p>
-<p>Here you see the details, in particular:</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>
+</blockquote>
+<p>And in the slot it will give you important details like:</p>
 <ul>
-<li>the status of the submission</li>
+<li>the status of the submission (on upload it will say: <code>"uploaded file into slot"</code>).</li>
 <li>the filename, which will be in the correct format, assuming you used
 <code>mkiocccentry(1)</code> which is <strong>HIGHLY</strong> recommended so that you do not break <a href="rules.html#rule17">Rule
 17</a>!</li>
 <li>the file length, which <code>txzchk(1)</code> will also verify (the file itself and the
-tarball listing)</li>
-<li>the upload date</li>
-<li>the SHA256 hash of the file</li>
+tarball listing).</li>
+<li>the upload date.</li>
+<li>the SHA256 hash of the file.</li>
 </ul>
 <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>
+<blockquote>
+<p>The file size of N exceeds the maximum size of 3999971.</p>
+</blockquote>
+<p>And if you try uploading an empty file you’ll instead see:</p>
+<blockquote>
+<p>The must not be empty.</p>
+</blockquote>
+<p>And if you see something like:</p>
+<blockquote>
+<p>Filename for slot: 0 must match this regular expression: <code>^submit.dd3d30c2-d8d0-4506-adcd-d4e029147f39-0\.[1-9][0-9] {9,}\.txz$</code></p>
+</blockquote>
+<p>where <code>0</code> is the slot and <code>dd3d30c2-d8d0-4506-adcd-d4e029147f39-01</code> is the UUID
+then you <strong>MUST</strong> upload a properly named XZ compressed tarball, <strong>MAKING SURE</strong> you
+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>
+</blockquote>
+<p>or:</p>
+<blockquote>
+<p>Status: submit file failed the txzchk test! Use mkiocccentry to rebuild and resubmit to this slot.</p>
+</blockquote>
+<p>… or <strong>ANY</strong> other error 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
+17</a>!</p>
 <p>After the submission deadline is reached, you can log in to check the status of
-your submissions. Here is what it will look like when the judges have verified
+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>
-<p><img src="../png/submit.status-updated.png"
- alt="submit server status updated"
- width=717 height=217></p>
+<blockquote>
+<p>Status: the format of this submission has been validated.</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
+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>
 <p>For details on <code>txzchk</code>, see the
 FAQ on “<a href="../faq.html#txzchk">txzchk</a>”.</p>
 <p>For details on <code>chkentry</code>, see the