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.

1990/westley/README.md

@@ -1,14 +1,14 @@
 ## To build:
 
 ```sh
-make all
+    make all
 ```
 
 
 ## To use:
 
 ```sh
-./westley <number>
+    ./westley <number>
 ```
 
 The number should be greater than 0.
@@ -17,7 +17,7 @@ The number should be greater than 0.
 ## Try:
 
 ```sh
-./try.sh
+    ./try.sh
 ```
 
 
@@ -31,14 +31,14 @@ The alternate code is provided to show how C changed.
 If you have an old enough compiler try and to see how C has changed over the years:
 
 ```sh
-make alt
+    make alt
 ```
 
 
 ### Alternate use:
 
 ```sh
-./westley.alt <number>
+    ./westley.alt <number>
 ```
 
 
@@ -51,11 +51,11 @@ Read each block of code as if it were a piece of correspondence.
 For example, the first block of code would read:
 
 ```
-charlie,
-	doubletime me, OXFACE!
-	not interested, get out
-	mainly die, charly, *die*
-		signed charlotte
+    charlie,
+	    doubletime me, OXFACE!
+	    not interested, get out
+	    mainly die, charly, *die*
+		    signed charlotte
 ```
 
 The original source had control-L's after each code block.  To