Improve SEO of documentation to make package more findable.l

[MicahGale]

If you search "python mcnp" on google or duckduckgo, MontePy is likely never on the first page of results. If you search "python mcnp input" on duckduckgo we then get bumped up to the front page.

We should go through our documentation to make sure that when people want something like MontePy, they actually can find this as a solution.

[MicahGale]

I recently set up Google search console, and Bing Webmaster for montepy.org. Bing actually has some ~recommendations~ complaints that would help with SEO:

Issue	Severity	pages affected
H1 tag missing	Notice	1
More than one h1 tag	Notice	2
Html size is too long	Warning	1
Title too long	Warning	10
Meta Description tag missing	Error	74

More details

• HTML too long. Shoot for < 125 kb. page: genindex.html
• H1 tag missing: genindex.html
• Title too long:
  • montepy.data_inputs.material_component
    • montepy.data_inputs.universe_input
    • montepy.surfaces.cylinder_par_axis
    • montepy.data_inputs.thermal_scattering
    • montepy.input_parser.thermal_parser
    • index.html
    • montepy.input_parser.surface_parser
    • montepy.numbered_object_collection
    • montepy.input_parser.input_syntax_reader
    • montepy.org
• more than 1 H1 tag:
  • index.html (2x)

[MicahGale]

See this sphinx directive for meta data. https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#html-meta