add next/submit.html and improve FAQ and other refs to entering the IOCCC

Added a new `next/submit.html` to move the "how to submit" form "in-line"
of the top FAQ entry into a new page managed by `next/submit.md`.
Thus, `next/submit.html` is a parallel to `next/register.html`
and `next/submit.md` is a parallel to `next/register.md`.

Changed the FAQ "faq.html#submit" and into "faq.html#enter".

Added individual tags for the steps in FAQ0.0.

Moved "faq.html#register" down to FAQ 0.0 step 2.

Added "faq.html#submit" for FAQ 0.0 step 5,
however elsewhere often "next/submit.html" is used.

Changed references for "faq.html#upload" to "next/submit.html".

We made a number of changes to the following markdown files to reflect the above:

- `about.md`
- `faq.md`
- `index.md`
- `markdown.md`
- `next/README.md`
- `next/README.md`
- `next/guidelines.md`
- `next/register.md`
- `next/rules.md`
- `nojs-menu.md`
- `status.md`

as well as these files:

- `bin/gen-top-html.sh`
- `bin/md2html.cfg`

and added:

- `next/submit.html`
- `next/submit.md`

Perform `make www` and `make gen_status` to perform the above and test under macOS.

TODO: Add images about the mailing list to `next/register.md`.  See the line:

```
XXX - **put images and other details about joining the mailing list here** - XXX
```

next/submit.md

@@ -0,0 +1,132 @@
+# How to upload your submission to the IOCCC
+
+**IMPORTANT NOTE**: The [IOCCC submit server](https://submit.ioccc.org)
+is only ready for submissions
+**ONLY WHEN THE CONTEST IS [open](../status.html#open)**.
+
+See [current status of the IOCCC](../status.html) for details on the contest status.
+**IMPORTANT NOTE**: When the contest is [closed](../status.html#closed), the
+[IOCCC submit server](https://submit.ioccc.org)
+may be offline and unreachable as a web site.
+
+The following steps should be taken, in order to upload your `mkiocccentry` xz
+compressed tarball, to change the file (if you need to upload a different file
+or you have updated the submission), and to check the status of it after the
+contest closes:
+
+First, open the web page in your browser. It should look like this:
+With the login id and password already input, It should look something like
+this:
+
+<img src="../png/submit-server-login.png"
+ alt="submit server login screen"
+ width=710 height=562>
+
+The login is the UUID you were provided when you registered for the IOCCC and
+the password is the initial password you were provided with. Click "Login".
+Assuming everything is fine, it should look something like:
+
+<img src="../png/submit-server-first-login.png"
+ alt="submit server password change required"
+ width=710 height=808>
+
+As you can see, you have to change your password. Put in your login (UUID
+username), your old (initial) password and a new password. For instance:
+
+<img src="../png/submit-server-change-passwd.png"
+ alt="submit server changing password"
+ width=710 height=808>
+
+Click "Change Password".
+
+Once this is done, you will have to log in again. Using the UUID login and the
+new password:
+
+<img src="../png/submit-server-passwd-changed.png"
+ alt="submit server password changed"
+ width=710 height=344>
+
+.. click "Login".
+
+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 overwrite the wrong one!
+
+Here is what it looks like without any uploads and no slot selected:
+
+<img src="../png/submit-server-slots.png"
+ alt="submit server slots"
+ width=710 height=806>
+
+Select a slot and then select a file by clicking the button "Choose File". After
+doing this, it should look something like:
+
+<img src="../png/submit-server-slot-file.png"
+ alt="submit server slot and file selected"
+ width=717 height=865>
+
+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:
+
+<img src="../png/submit-server-change-file.png"
+ alt="submit server change file"
+ width=717 height=865>
+
+Once you're certain you have selected the correct file, click "Submit", below
+the file selection step.
+
+When it's uploaded it should look something like this:
+
+<img src="../png/submit-server-submission-uploaded.png"
+ alt="submit server submission uploaded"
+ width=717 height=525>
+
+Here you see the details, in particular:
+
+- the status of the submission
+- the filename, which will be in the correct format, assuming you used
+`mkiocccentry(1)` which is **HIGHLY** recommended so that you do not break [Rule
+17](rules.html#rule17)!
+- the file length, which `txzchk(1)` will also verify (the file itself and the
+tarball listing)
+- the upload date
+- the SHA256 hash of the file
+
+Now if you're done, log out.
+
+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
+that your tarball / submission has been validated (NOT judged), by `txzchk(1)`
+and `chkentry(1)`.:
+
+<img src="../png/submit-server-status-updated.png"
+ alt="submit server status updated"
+ width=717 height=217>
+
+For details on `txzchk`, see the
+FAQ on "[txzchk](../faq.html#txzchk)".
+
+For details on `chkentry`, see the
+FAQ on "[chkentry](../faq.html#chkentry)".
+
+If you need more information on what `chkentry` checks, see the
+FAQ on the [".info.json file](../faq.html#info_json)"
+and the
+FAQ on the "[.auth.json file](../faq.html#auth_json)".
+
+
+
+<!--
+
+    Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
+
+    You are free to share and adapt this file under the terms of this license:
+
+        Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+    For more information, see:
+
+        https://creativecommons.org/licenses/by-sa/4.0/
+
+-->