fix links in 1992/buzzard.2/buzzard.2.README.html

The `1992/buzzard.2/buzzard.2.README.md` has been improved
so that links to files that is referenced are
directed to the proper web pages (web site or GitHub).

Links in `1992/buzzard.2/buzzard.2.README.md` markdown
files have been changed to the generated HTML files.

Changed `bin/gen-other-html.sh` VERSION from to "1.0.4 2024-04-13"
to "1.1 2024-04-20".

By default, we substitute _%%REPO_URL%%_ and _%%SITE_URL%%_
in inc files.

Changed `bin/subst.default.sh` VERSION from to "1.2.3 2024-04-13"
to "1.3 2024-04-20".

All `-s TOKEN=value` substitutions are applied to all markdown files
that are processed by `bin/md2html.sh`.

Substitutions of and **%%TOKEN%%** are performed on included HTML
content, content generated by the ‘before tool’ (-b tool), content
generated by the ‘after tool’ (-a tool), as well as the markdown
content given to the pandoc wrapper tool (-p tool).

It is an error, unless -S is given, for any phase, except HTML phases
20-29, to not substitute all **%%TOKEN%%**'s. For HTML phases 20-29, any
**%%TOKEN%%** that is not substituted are passed thru without substitution.

Update `bin/index.html` to clarify

Changed `bin/md2html.sh` VERSION from to "1.4 2024-04-18"
to "1.5 2024-04-20".

Fix the _BEFORE: 1st line of markdown file_ and _AFTER: last line
of markdown file_ HTML comments so that the true markdown file
source (not some temporary file) is identified.  This prevents
`authors.html`, `location.html` and `years.html` from always changing
due to different temporary files being used on each run.

Run `make www` to perform the above.

1992/buzzard.2/buzzard.2.README.md

@@ -1,14 +1,16 @@
-[buzzard.2.README.md](buzzard.2.README.md)  this file\
-[buzzard.2.design.md](buzzard.2.design.md)  description of FIRST (design documentation of THIRD)\
-[third](third)				    implementation of THIRD in FIRST\
-[help.th](help.th)			    online listing of THIRD primitives\
+# Useful files to view
+
+- [buzzard.2.README.html](buzzard.2.README.html)	- this file
+- [buzzard.2.design.html](buzzard.2.design.html)	- description of FIRST (design documentation of THIRD)
+- [third](%%REPO_URL%%/1992/buzzard.2/third)		- implementation of THIRD in FIRST
+- [help.th](%%REPO_URL%%/1992/buzzard.2/help.th)		- online listing of THIRD primitives
 
 
 # FIRST demos:
 
 Use  `./first < <demo>`.
 
-[demo1.1st](demo1.1st)		prints Hello World! assuming ASCII
+- [demo1.1st](demo1.1st)				- prints Hello World! assuming ASCII
 
 
 # THIRD demos:
@@ -18,20 +20,27 @@ Use `cat third <demo> | ./first`.
 
 ## Demo files:
 
-[demo1.th](demo1.th)		prints Hello World! regardless of character set
-[demo2.th](demo2.th)		demonstrates a simple loop
-[demo3.th](demo3.th)		demonstrates a simple if test
-[demo4.th](demo4.th)		recursive factorial calculating on the way up
-[demo5.th](demo5.th)		recursive factorial calculating on the way down
-[demo6.th](demo6.th)		demonstrates switching from compiler to execution mode
+- [demo1.th](%%REPO_URL%%/1992/buzzard.2/demo1.th)	- prints Hello World! regardless of character set
+- [demo2.th](%%REPO_URL%%/1992/buzzard.2/demo2.th)	- demonstrates a simple loop
+- [demo3.th](%%REPO_URL%%/1992/buzzard.2/demo3.th)	- demonstrates a simple if test
+- [demo4.th](%%REPO_URL%%/1992/buzzard.2/demo4.th)	- recursive factorial calculating on the way up
+- [demo5.th](%%REPO_URL%%/1992/buzzard.2/demo5.th)	- recursive factorial calculating on the way down
+- [demo6.th](%%REPO_URL%%/1992/buzzard.2/demo6.th)	- demonstrates switching from compiler to execution mode
 
 
 # Interactive THIRD:
 
-Use `cat third - | ./first`.
+Use:
 
-To include the primitive on-line help, use
-`cat third help.th - | ./first`.
+```
+cat third - | ./first
+```
+
+To include the primitive on-line help, use:
+
+```
+cat third help.th - | ./first
+```
 
 
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