Add more missing vocab items

[randy5235]

In reference to Issue https://github.com/dahlia/fedify/issues/65

Add: vocab/arrive.yaml vocab/invite.yaml vocab/join.yaml vocab/leave.yaml vocab/listen.yaml

Updated the snapshot per the contribution instructions. I did have to update the snapshots as they were missing some references to the new vocab items

Please verify the snapshots look correct, I would rather not introduce a bad snapshot.

Please reach out if there is anything further I can add to help this land.

[codecov[bot]]

Codecov Report

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

Project coverage is 80.12%. Comparing base (3d6cea3) to head (1fd0270).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #80 +/- ## ========================================== - Coverage 80.14% 80.12% -0.02% ========================================== Files 39 39 Lines 5831 5831 Branches 676 676 ========================================== - Hits 4673 4672 -1 - Misses 1146 1147 +1 Partials 12 12 ```

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[randy5235]

Absolutely.

[randy5235]

Oops, all the Markdown files have been reformatted, could you please just add the content without the formatting changes?

Sorry about that, my local lint rules reformatted it. It should be fixed now.