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/grothe/README.md

@@ -1,7 +1,7 @@
 ## To build:
 
 ```sh
-make
+    make
 ```
 
 
@@ -10,22 +10,22 @@ make
 To create a shared secret shared among `M` people with `N+1` needed to reconstruct:
 
 ```sh
-./grothe -secret 1-/dev/urandom 2-/dev/urandom ... \
-    N-/dev/urandom 1+shared1 2+shared2 ... M+sharedM
+    ./grothe -secret 1-/dev/urandom 2-/dev/urandom ... \
+	N-/dev/urandom 1+shared1 2+shared2 ... M+sharedM
 ```
 
 To reconstruct the original (an arbitrary combination of `N+1` or
 more shared files with their proper numbers):
 
 ```sh
-./grothe I-sharedI J-sharedJ K-sharedK ... +reconstructed
+    ./grothe I-sharedI J-sharedJ K-sharedK ... +reconstructed
 ```
 
 
 ## Try:
 
 ```sh
-./try.sh
+    ./try.sh
 ```
 
 
@@ -76,18 +76,18 @@ To split a secret into 4 pieces of which at least 3 will be needed to get it (in
 this case the cookie recipe) back:
 
 ```sh
-./grothe \
-    -cookie_recipe.txt\
-    1-/dev/urandom 2-/dev/urandom\
-    1+cookie_piece1.dat 2+cookie_piece2.dat 3+cookie_piece3.dat 4+cookie_piece4.dat
+    ./grothe \
+	-cookie_recipe.txt\
+	1-/dev/urandom 2-/dev/urandom\
+	1+cookie_piece1.dat 2+cookie_piece2.dat 3+cookie_piece3.dat 4+cookie_piece4.dat
 ```
 
 To put the recipe back together using the first, second and fourth pieces:
 
 ```sh
-./grothe \
-    1-cookie_piece1.dat 2-cookie_piece2.dat 4-cookie_piece4.dat
-    +cookie_recipe_restore.txt
+    ./grothe \
+	1-cookie_piece1.dat 2-cookie_piece2.dat 4-cookie_piece4.dat
+	+cookie_recipe_restore.txt
 ```