More docs tweaks

[zmoon]

• "USCRN Python" as the HTML title (also shows as title of the primary sidebar)
• "USCRN" instead of "CRN"
• initial nb using the station metadata (towards #17)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (2cd4737) 96.77% compared to head (be7f889) 97.44%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #23 +/- ## ========================================== + Coverage 96.77% 97.44% +0.66% ========================================== Files 3 3 Lines 434 430 -4 ========================================== - Hits 420 419 -1 + Misses 14 11 -3 ```

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