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.

2018/endoh2/README.md

@@ -1,21 +1,21 @@
 ## To build:
 
 ```sh
-make
+    make
 ```
 
 
 ## To use:
 
 ```sh
-./prog
+    ./prog
 ```
 
 
 ## Try:
 
 ```sh
-./try.sh
+    ./try.sh
 ```
 
 NOTE: to interrupt the loops send intr (typically ctrl-C).
@@ -59,23 +59,23 @@ different"](https://en.wikipedia.org/wiki/And_Now_for_Something_Completely_Diffe
 is also used in the opening.
 
 ```
-                             ___-----__
-                          _--          --__
-                        _-        _--_     \
-                      _-    /\  +-.:.:-+ /\ \
-                     /      \/  |.:.:.:| \/  |
-                    /           |:.:.:.|     |
-                   /            |.:.:.:|      |       ___-----___
-                  |              |.:.:|       |      /           \
-                  |              |:.:.|       |     <   It's ...  |
-                  \               |:.|       |       \           /
-                   \               ||        |        ---_____---
-                 _--\                       |
-               _-    -__                    |
-            __-         --___               |
-          _-                                |
-         /                                   |
-        |                                     |
+			 ___-----__
+		      _--          --__
+		    _-        _--_     \
+		  _-    /\  +-.:.:-+ /\ \
+		 /      \/  |.:.:.:| \/  |
+		/           |:.:.:.|     |
+	       /            |.:.:.:|      |       ___-----___
+	      |              |.:.:|       |      /           \
+	      |              |:.:.|       |     <   It's ...  |
+	      \               |:.|       |       \           /
+	       \               ||        |        ---_____---
+	     _--\                       |
+	   _-    -__                    |
+	__-         --___               |
+      _-                                |
+     /                                   |
+    |                                     |
 ```
 
 <!--