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.

1993/ejb/README.md

@@ -1,27 +1,27 @@
 ## To build:
 
 ```sh
-make all
+    make all
 ```
 
 
 ## To use:
 
 ```sh
-./ejb level
+    ./ejb level
 ```
 
 where:
 
 ```sh
-level   a value from -128 to 127
+    level   a value from -128 to 127
 ```
 
 
 ## Try:
 
 ```sh
-./try.sh
+    ./try.sh
 ```
 
 
@@ -46,7 +46,7 @@ We note that this also works under macOS just fine.
 #### Output solution to Towers of Hanoi for five rings:
 
 ```sh
-./ejb 5
+    ./ejb 5
 ```
 
 The format of the output for the Towers of Hanoi case is simply a
@@ -55,7 +55,7 @@ text description of how to solve the puzzle.
 #### Output solution to the Patience puzzle for six rings:
 
 ```sh
-./ejb -6
+    ./ejb -6
 ```