improved indentation and whitespace for markdown code blocks

All code blocks in markdown have been intended by at least 4 spaces.

We add `--tab-stop=8` to all `pandoc(1)` executions in order to set
a better tab stop indentation, especially for tab intended code blocks.

Changed `bin/pandoc-wrapper.sh` VERSION from "1.5.3 2024-03-26"
to "1.6 2024-03-31".

Fixed `1991/brnstnd/sorta.README.md` so that the sorta code
is code blocks.

Removed unneeded paragraph group in copyright in `inc/footer.default.html`.

Fixed excess whitespace after list Author on entry `index.html` page.

Changed `bin/output-index-author.sh` VERSION from "1.5.2 2024-03-26"
to "1.6 2024-03-31".

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

TODO: Fix the problem of the initial line of code being extra intended.
TODO: Fix excess whitespace around code that is inline.

1994/README.md

@@ -60,7 +60,7 @@ Any of the following, though not required, would be a plus:
 If you think this may be you, send an email before 31 Dec 1995, to:
 
 ```
-judges@toad.com		(use the Subject: 3rd judge)
+    judges@toad.com		(use the Subject: 3rd judge)
 ```
 
 Include in your message:
@@ -82,7 +82,7 @@ access to put up some IOCCC html pages, please send an email (say prior
 to 31 Dec 1995) to:
 
 ```
-judges@toad.com		(use the Subject: www site)
+    judges@toad.com		(use the Subject: www site)
 ```
 
 describing your site and any other appropriate comments.  Thanks!
@@ -107,8 +107,8 @@ Also include anything else that you would like to see in future contests.
 Send such email to:
 
 ```
-...!{sun,pacbell,uunet,pyramid}!hoptoad!judges
-judges@toad.com
+    ...!{sun,pacbell,uunet,pyramid}!hoptoad!judges
+    judges@toad.com
 ```
 
 If you use, distribute or publish these entries in some way, please drop