Don't display Twitter handles

[cthoyt]

Twitter/X no longer reflects the values of an inclusive and open scientific community, so the Bioregistry isn't going to display organizations' Twitter handles anymore. This PR doesn't delete those from the underlying data - they still might be useful for historical purposes.

[codecov[bot]]

Codecov Report

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

Project coverage is 40.55%. Comparing base (39e8cf0) to head (2dd6ad3). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1088 +/- ## ======================================= Coverage 40.55% 40.55% ======================================= Files 150 150 Lines 8341 8341 Branches 1929 1929 ======================================= Hits 3383 3383 Misses 4767 4767 Partials 191 191 ```

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