rename bin/gen-top-html.sh, added archive/historic/index.html

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`.

bin/README.md

@@ -102,14 +102,14 @@ bin/gen-other-html.sh -v 1
 ```
 
 
-### [gen-top-md2html.sh](gen-top-md2html.sh)
+### [gen-top-html.sh](gen-top-html.sh)
 
 Generate a number of top level HTML pages for the IOCCC web sites.
 
 Usage:
 
 ```sh
-bin/gen-top-md2html.sh -v 1
+bin/gen-top-html.sh -v 1
 ```
 
 Examples of top level HTML pages built by this tool include:

bin/gen-top-html.sh

@@ -1,8 +1,10 @@
 #!/usr/bin/env bash
 #
-# gen-top-md2html.sh - generate select top level HTML files from markdown files
+# gen-top-html.sh - generate select top level HTML files from markdown files
 #
 # We also generate the bin/index.html file from the bin/README.md file.
+# We also generate the inc/index.html file from the inc/README.md file.
+# We also generate the archive/historic/index.html file from the archive/historic/README.md file.
 #
 # Copyright (c) 2024 by Landon Curt Noll.  All Rights Reserved.
 #
@@ -52,7 +54,7 @@ TOP_MD_SET+=("faq")
 
 # set variables referenced in the usage message
 #
-export VERSION="1.1 2024-02-28"
+export VERSION="1.2 2024-02-29"
 NAME=$(basename "$0")
 export NAME
 export V_FLAG=0
@@ -78,6 +80,7 @@ export SITE_URL="https://ioccc-src.github.io/temp-test-ioccc"
 unset TOP_MD_SET
 TOP_MD_SET+=("CODE_OF_CONDUCT")
 TOP_MD_SET+=("README")
+TOP_MD_SET+=("archive/historic/README")
 TOP_MD_SET+=("bin/README")
 TOP_MD_SET+=("bugs")
 TOP_MD_SET+=("contact")
@@ -445,6 +448,10 @@ for name in "${TOP_MD_SET[@]}"; do
     if [[ $name == inc/README ]]; then
 	HTML_FILE="inc/index.html"
     fi
+    # archive/historic/README is a special case
+    if [[ $name == archive/historic/README ]]; then
+	HTML_FILE="archive/historic/index.html"
+    fi
 
     # use the md2html.sh tool to form the HTML file, unless -n
     #

bin/index.html

@@ -10,7 +10,7 @@
 <!-- -->
 <!-- END: this line ends content from: inc/top.default.html -->
 <!-- -->
-<!-- The original markdown content was formed by the tool: bin/gen-top-md2html.sh -->
+<!-- The original markdown content was formed by the tool: bin/gen-top-html.sh -->
 <!-- The HTML was converted from markdown by the tool: bin/md2html.sh -->
 <!-- -->
 <!-- START: this line starts content from: inc/head.default.html -->
@@ -150,13 +150,13 @@ href="gen-other-html.sh">gen-other-html.sh</a></h3>
 index.html HTML files.</p>
 <p>Usage:</p>
 <div class="sourceCode" id="cb9"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="ex">bin/gen-other-html.sh</span> <span class="at">-v</span> 1</span></code></pre></div>
-<h3 id="gen-top-md2html.sh"><a
-href="gen-top-md2html.sh">gen-top-md2html.sh</a></h3>
+<h3 id="gen-top-html.sh"><a
+href="gen-top-html.sh">gen-top-html.sh</a></h3>
 <p>Generate a number of top level HTML pages for the IOCCC web
 sites.</p>
 <p>Usage:</p>
 <div class="sourceCode" id="cb10"><pre
-class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="ex">bin/gen-top-md2html.sh</span> <span class="at">-v</span> 1</span></code></pre></div>
+class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="ex">bin/gen-top-html.sh</span> <span class="at">-v</span> 1</span></code></pre></div>
 <p>Examples of top level HTML pages built by this tool include:</p>
 <ul>
 <li><a href="CODE_OF_CONDUCT.html">CODE_OF_CONDUCT.html</a></li>