Move to custom search plugin by borrowing from Mkdocs and existing plugins

docs/search/README.md

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+# Search plugin
+
+This is a search plugin that modifies and combines code from two projects:
+
+- Sphinxcontrib-lunrsearch (https://github.com/rmcgibbo/sphinxcontrib-lunrsearch) - the lunr-index
+  generation component was reworked to read more than just the api and addded supoort for
+  using the `lunr` python library to pre-generate the search index.
+- Mkdocs lunr search (https://www.mkdocs.org/) - the javascript components with
+  web-worker support, using the index generated by the above module.
+
+Parsing of the documentation to create the index is custom.