Healpix doc

[Vidushi-GitHub]

Description

Add document for parsing and using HEALPix docs

Explaining what it represents, how one can understand a skymap

• Mollweide skymap shape, compare to map of glob projected onto flat surface
• What are multi-order skymaps?
• Explain difference between them, why they exist (size)
• How to work with healpix maps
• Which packages you need, here you can link to the various package documentations
• What each of the packages do
• Read in a skymap
• How to identify credibility regions (existing IGWN docs are pretty much what we need)
• Identifying a point being inside that credibility region
• Finding probability of cone/polygon (essentially credibility region for x%) (another IGWN doc)
• At the end of the section, link to IGWN docs for further information (or at start of section? Can discuss)
• Usage of 2d/3d skymaps, link to more extensive docs on this topic
• Moc papers?

Resolves: #2035

[lpsinger]

Please fix the following build error:

css-bundle-entry-module:__remix_cssBundleEntryModule__:45:25: ERROR: [plugin: remix-mdx] Could not parse import/exports with acorn: SyntaxError: Unexpected token [plugin css-bundle-plugin]

The cause of this error is the imports in your Python sample code, which is enclosed in triple quotes ('''). Triple quotes don't do anything in Markdown, so the MDX parser is attempting to interpret those lines as JavaScript imports. The correct delimiter for a code block in Markdown is triple backticks (```).