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.

2012/zeitak/README.md

@@ -1,7 +1,7 @@
 ## To build:
 
 ```sh
-make
+    make
 ```
 
 There is an alternate version that is slightly deobfuscated. See [alternate
@@ -11,7 +11,7 @@ code](#alternate-code) below.
 ## To use:
 
 ```sh
-./zeitak < file
+    ./zeitak < file
 ```
 
 where `file` is the file to be checked for nesting errors. For example, you may
@@ -22,7 +22,7 @@ text files that are not code.
 ## Try:
 
 ```sh
-make test
+    make test
 ```
 
 NOTE: the program prints an error and exits on the first nesting error so it
@@ -39,7 +39,7 @@ understand this extremely subtle entry.
 ### Alternate build:
 
 ```sh
-make alt
+    make alt
 ```
 
 
@@ -61,7 +61,7 @@ just to understand _18 key **characters**_ of this code.
 NOTE: if you use vim to view the code, make sure to do:
 
 ```
-:set tabstop=4
+    :set tabstop=4
 ```
 
 in command mode, before looking at the code, to see the correct layout.
@@ -93,7 +93,7 @@ around it's position.
   will be detected in the following line:
 
 ```c
-printf(")");
+    printf(")");
 ```
 
 * Doesn't get confused by the [1984/anonymous](../../1984/anonymous/index.html) entry!
@@ -105,7 +105,7 @@ printf(")");
   an error:
 
 ```c
-printf("\"");
+    printf("\"");
 ```
 
 #### Obfuscation