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.

2001/jason/README.md

@@ -1,14 +1,14 @@
 ## To build:
 
 ```sh
-make
+    make
 ```
 
 
 ## To use:
 
 ```sh
-./jason
+    ./jason
 ```
 
 
@@ -38,13 +38,13 @@ TED Shroyer came up with the idea that made it possible to hide all
 the text.  Thanks, TED.  You won.  :)
 
 ```sh
-cc -o jason jason.c
-./jason
-you are in a maze of twisty little passages
-caves lead:  left forward back
-you see
-   a lamp
-> _
+    cc -o jason jason.c
+    ./jason
+    you are in a maze of twisty little passages
+    caves lead:  left forward back
+    you see
+       a lamp
+    > _
 ```
 
 This program is a rather nostalgic little labyrinth game.  Start
@@ -117,14 +117,6 @@ the game entertaining, see if you can find
 in the source code.)
 
 
-
-
-
-
-
-
-
-
 ### GAME STRATEGY SPOILER
 
 The trick, of course, is to drop items in empty rooms to mark them.  That way