Hosting: migrate source control hosting from GitHub to Codeberg

[jayaddison]

Is your feature request related to a problem? Please describe.
We would like to reduce our dependence on Microsoft-owned infrastructure; GitHub was acquired by Microsoft in Y2018.

Codeberg seems to align well with our values; it is based in Germany, within the relatively strong privacy provisions of the EU, and it is built on Forjejo, and open source code forge system -- meaning that if we encounter problems or want to suggest improvements, it respects our ability to do so as a public contributor at a source-code level.

Describe the solution you'd like

• All source code repositories belonging to OpenCulinary and RecipeRadar should be migrated to the relevant organizations on Codeberg:
  • openculinary -> https://codeberg.org/openculinary
  • reciperadar -> https://codeberg.org/reciperadar
  • Forks do not need to be migrated.
  • Archived repositories should be migrated.
• Migrated repositories should be mirrored from their migrated repository locations on Codeberg to their existing repository locations on GitHub.
  • In other words, Codeberg will become the primary source-of-truth, issue-reporting and pull request destination; changes committed there will be mirrored back to GitHub.

Describe alternatives you've considered
N/A

Additional context
It may make sense to create an appropriately-scoped GitHub API access token to decrease the chance of being unnecessarily rate-limited during migration.

[jayaddison]

Three read-only repository-level permissions appear to be required:

• Contents: read-only
• Issues: read-only
• Pull requests: read-only

These implicitly enable the metadata read-only permission.

No organization-level permissions (neither read nor write) appear to be required for our migration.

Edit: fixup: add contents permission requirement (was mistakenly: repository)