add npm/github links to docs front page

[codecov[bot]]

Codecov Report

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

Project coverage is 96.42%. Comparing base (3a9c9ed) to head (ac6aa39). Report is 10 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #499 +/- ## ========================================== + Coverage 96.40% 96.42% +0.01% ========================================== Files 20 20 Lines 1281 1285 +4 Branches 268 269 +1 ========================================== + Hits 1235 1239 +4 Misses 45 45 Partials 1 1 ```

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