Do not expose the extension in search

[libpitt]

From the search results dropdown, the user should be navigated to the page without the .html extension. Also, avoid default page name index

Example:
Navigate the user to: https://docs.sennetconsortium.org/libraries/clt/ not https://docs.sennetconsortium.org/libraries/clt/index.html

Or https://docs.sennetconsortium.org/apis/getting-started not https://docs.sennetconsortium.org/apis/getting-started.html