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.

1985/august/README.md

@@ -1,21 +1,21 @@
 ## To build:
 
 ```sh
-make all
+    make all
 ```
 
 
 ## To use:
 
 ```sh
-./august
+    ./august
 ```
 
 
 ## Try:
 
 ```sh
-./try.sh
+    ./try.sh
 ```
 
 If you have the `primes(6)` tool (sometimes part of [BSD
@@ -23,8 +23,8 @@ Games](https://github.com/vattam/BSDGames)) you can see
 what of the output in the first `N` (say `15` or `25`) lines are primes:
 
 ```sh
-./primes.sh # 15
-./primes.sh 25
+    ./primes.sh # 15
+    ./primes.sh 25
 ```
 
 Note that `try.sh` will run this script anyway, telling you where to get