Add rendered documentation, based on Sphinx, and hosted at Read the Docs

[amotl]

What the title says.

[codecov[bot]]

Codecov Report

Base: 55.89% // Head: 55.89% // No change to project coverage :thumbsup:

Coverage data is based on head (1fa1508) compared to base (f8410aa). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #55 +/- ## ======================================= Coverage 55.89% 55.89% ======================================= Files 3 3 Lines 297 297 ======================================= Hits 166 166 Misses 131 131 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `55.89% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=earthobservations#carryforward-flags-in-the-pull-request-comment) to find out more. Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=earthobservations). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=earthobservations)

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