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.

2011/eastman/README.md

@@ -1,14 +1,14 @@
 ## To build:
 
 ```sh
-make
+    make
 ```
 
 
 ## To use:
 
 ```sh
-./eastman
+    ./eastman
 ```
 
 NOTE: to restore your cursor in your shell, try `reset`.
@@ -20,7 +20,7 @@ Run the program. Quit it (ctrl-c/intr). Resize your terminal window. Run it
 again. Try doing this a number of times with different sizes each time.
 
 ```sh
-./eastman
+    ./eastman
 ```
 
 NOTE: to restore your cursor in your shell, try `reset`.
@@ -61,7 +61,7 @@ program is running, though.  It only checks the size once, when it starts up.
 To compile:
 
 ```sh
-cc -lm eastman.c
+    cc -lm eastman.c
 ```