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/hou/README.md

@@ -1,21 +1,21 @@
 ## To build:
 
 ```sh
-make
+    make
 ```
 
 
 ## To use:
 
 ```sh
-./hou 'expression'
+    ./hou 'expression'
 ```
 
 
 ## Try:
 
 ```sh
-./try.sh
+    ./try.sh
 ```
 
 As the script asks you, what does the last one mean? Can you get it to report a
@@ -33,8 +33,8 @@ source code. What does it mean?
 The calculator obeys the precedence rules and allows parenthesis.
 
 ```sh
-./hou '1+2*3'
-./hou '(1+2)*3'
+    ./hou '1+2*3'
+    ./hou '(1+2)*3'
 ```
 
 What exactly does the text formatting do?
@@ -42,7 +42,7 @@ What exactly does the text formatting do?
 What does this evaluate to in C?
 
 ```c
-+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
+    +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
 ```