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.

1984/laman/README.md

@@ -1,14 +1,14 @@
 ## To build:
 
 ```sh
-make all
+    make all
 ```
 
 
 ## To use:
 
 ```sh
-./laman <positive number>
+    ./laman <positive number>
 ```
 
 
@@ -18,11 +18,11 @@ The program accepts ONE POSITIVE number.  Seeing is believing, so try things
 like:
 
 ```sh
-./try.sh
+    ./try.sh
 
-./laman 4
-./laman 9
-./laman 16
+    ./laman 4
+    ./laman 9
+    ./laman 16
 ```
 
 This code should run you in circles.
@@ -34,15 +34,15 @@ Some new compilers (in 1984) dislike lines 6 and 10 of the source, so we changed
 them from:
 
 ```c
-;++f)a[		b<<5|c]		=d++,b+		=e;for(		f=0;f<O
-<<5|c]^		=a[b<<5		|c]^=a[		(k-(b+1		))<<5|c]
+    ;++f)a[		b<<5|c]		=d++,b+		=e;for(		f=0;f<O
+    <<5|c]^		=a[b<<5		|c]^=a[		(k-(b+1		))<<5|c]
 ```
 
 to:
 
 ```c
-;++f)a[		b<<5|c]		=d++,b+=	e;for(		f=0;f<O
-<<5|c]^=	a[b<<5		|c]^=a[		(k-(b+1		))<<5|c]
+    ;++f)a[		b<<5|c]		=d++,b+=	e;for(		f=0;f<O
+    <<5|c]^=	a[b<<5		|c]^=a[		(k-(b+1		))<<5|c]
 ```
 
 I hope you have a C beautifier!