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.

2000/tomx/README.md

@@ -1,7 +1,7 @@
 ## To build:
 
 ```sh
-make
+    make
 ```
 
 There is an alternate version that compiles [mkentry.c](mkentry.c). See
@@ -11,14 +11,14 @@ There is an alternate version that compiles [mkentry.c](mkentry.c). See
 ## To use:
 
 ```sh
-./tomx
+    ./tomx
 ```
 
 
 ## Try:
 
 ```sh
-./try.sh
+    ./try.sh
 ```
 
 
@@ -33,14 +33,14 @@ using it as a Makefile and running the code ends up running `mkentry`.
 ### Alternate build:
 
 ```sh
-make alt
+    make alt
 ```
 
 
 ### Alternate try:
 
 ```sh
-./try.alt.sh
+    ./try.alt.sh
 ```
 
 
@@ -101,9 +101,9 @@ source still acceptable to `make` and `sh`. The following modification to the
 last few lines will compile the IOCCC's famous [mkentry.c](mkentry.c).
 
 ```
-.PHONY: /* true clean */
-#undef   true
-#include "mkentry.c"
+    .PHONY: /* true clean */
+    #undef   true
+    #include "mkentry.c"
 ```
 
 Ain't that useful?