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.

2015/endoh2/README.md

@@ -1,21 +1,21 @@
 ## To build:
 
 ```sh
-make
+    make
 ```
 
 
 ## To use:
 
 ```sh
-./prog
+    ./prog
 ```
 
 
 ## Try:
 
 ```sh
-./try.sh
+    ./try.sh
 ```
 
 
@@ -32,9 +32,9 @@ At this point you might be wondering, [WTF](http://acronyms.thefreedictionary.co
 How is this code obfuscated?  Well look again:
 
 ```sh
-less prog.c
+    less prog.c
 
-more prog.c
+    more prog.c
 ```
 
 Where did those underscores come from?  Well [RTFS](http://acronyms.thefreedictionary.com/RTFS)!\*\*
@@ -50,9 +50,9 @@ If you are still puzzled, look at [prog.c](prog.c) with your favorite text edito
 **Follow these instructions literally!**
 
 ```sh
-cat prog.c
-gcc -w -o prog prog.c
-./prog
+    cat prog.c
+    gcc -w -o prog prog.c
+    ./prog
 ```
 
 You will do a double take.