chore(release): 1.0.0-alpha.21 [skip ci]

# [1.0.0-alpha.21](https://code.podlibre.org/podlibre/castopod/compare/v1.0.0-alpha.20...v1.0.0-alpha.21) (2020-11-24)

### Features

* **platforms:** add Fediverse and some funding platforms, add link on logo ([afc3d502](https://code.podlibre.org/podlibre/castopod/commit/afc3d50289bb4173e0697d109ffe72f6814b93d1))