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.

2014/morgan/README.md

@@ -1,21 +1,21 @@
 ## To build:
 
 ```sh
-make
+    make
 ```
 
 
 ## To use:
 
 ```sh
-./prog [arg ..]
+    ./prog [arg ..]
 ```
 
 
 ## Try:
 
 ```sh
-./try.sh
+    ./try.sh
 ```
 
 
@@ -78,9 +78,9 @@ It will recursively use itself for sub-make (the `MAKE=` assignment inside
 With gcc 4.8.2 on Linux Ubuntu 14.04 64-bit :
 
 ```
-prog.c:22:15: warning: return makes integer from pointer without a cast [enabled by default]
-prog.c:23:72: warning: signed and unsigned type in conditional expression [-Wsign-compare]
-prog.c:12:11: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
+    prog.c:22:15: warning: return makes integer from pointer without a cast [enabled by default]
+    prog.c:23:72: warning: signed and unsigned type in conditional expression [-Wsign-compare]
+    prog.c:12:11: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
 ```
 
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