We rename `bin/gen-top-md2html.sh` to `bin/gen-top-html.sh`. Modified the `bin/gen-top-html.sh` tool to build `archive/historic/index.html` from `archive/historic/README.md`. In `bin/gen-top-html.sh` changed VERSION from "1.1 2024-02-28" to "1.2 2024-02-29". Renamed `make gen_top_md2html` to `gen_top_html` in the top level `Makefile`. Improved `archive/historic/README.md`. Updated `robots.txt` to include the Sitemap directive. Moved unused `valid-html401.png` to `png/valid-html401.png`. This png image may be used later. Performed `make gen_top_html` which rebuilt all top level HTML files as well as `bin/index.html` and `inc/index.html`.
inc
The inc directory holds content that is used by the tools in the bin directory.
Why the name inc?
We use inc because "include" would be misleading for both C and because the contents of HTML files under inc are not really included by the web server or the browser. Content of HTML files is processed by tools the bin directory. Processing can include substitution of strings of the form %%CURDS%% with some command line supplied value by the tool in question.