Various fixes in next and top level directory

Some broken links were fixed in some of the files like next/index.html,
next/pw-change.html, next/index.html and status.html.

Some wrong images were used in next/submit.html (or at least referred to
wrong if not wrong image).

Useful update to FAQ about the answers file in mkiocccentry.

There might have been other things.

This might be all that is needed for next/ wrt the register/change
password/submit but it's possible something has slipped through.

next/submit.html

@@ -431,13 +431,16 @@ is only ready for submissions
 <p>See <a href="../status.html">current status of the IOCCC</a> for details on the contest status.
 <strong>IMPORTANT NOTE</strong>: When the contest is <a href="../status.html#closed">closed</a>, the
 <a href="https://submit.ioccc.org">IOCCC submit server</a>
-may be offline and unreachable as a web site.</p>
+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. It should look like this:</p>
-<p><img src="../png/submit-server-passwd-changed.png"
- alt="submit server password changed"
+in your browser. Fill in your login credentials and click “Login”.
+It might look something like:</p>
+<p><img src="../png/submit-server-login.png"
+ alt="submit server login page"
  width=710 height=344></p>
-<p>.. click “Login”.</p>
+<p>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>
 <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 overwrite the wrong one!</p>