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.

status.md

@@ -11,7 +11,7 @@ than this comment.  :-)
 The JSON member value must be the following JSON quoted string:
 
 ```json
-"mandatory comment: because comments were removed from the original JSON spec"
+    "mandatory comment: because comments were removed from the original JSON spec"
 ```
 
 
@@ -101,7 +101,7 @@ The JSON member value is a JSON quoted string obtained from the date field
 of the following `ls(1)` command:
 
 ```ls
-TZ=UTC ls -D '%FT%T+00:00' -ld news.html
+    TZ=UTC ls -D '%FT%T+00:00' -ld news.html
 ```
 
 **NOTE**: The date and time are given with respect to **UTC** timezone.
@@ -119,7 +119,7 @@ The JSON member value is a JSON quoted string obtained from the date field
 of the following `ls(1)` command:
 
 ```ls
-TZ=UTC ls -D '%FT%T+00:00' -ld status.json
+    TZ=UTC ls -D '%FT%T+00:00' -ld status.json
 ```
 
 **NOTE**: The date and time are given with respect to **UTC** timezone.