Developer specialties MVP

[joemasilotti]

This PR adds specialty tags to developer profiles.

These tags give developers an opportunity to showcase their unique skills and interests. Limited to only 5 to prevent spam and keep focus, they will help businesses find their ideal candidates even faster. Leading, ideally, to more developers getting contacted. Even after they fall off the first page of results.

To-do

• Data modeling, migrations, and database seeds
• Admin CRUD
• UI for developer profiles and index view
• UX for specialties when updating a developer profile
• UX for requesting a new specialty
• UX for filtering developers by (multiple) specialties
• Feature flag to toggle UI, input, and filtering
• Add tests

Pull request checklist

• My code contains tests covering the code I modified
• I linted and tested the project with bin/check
• I added significant changes and product updates to the changelog

[joemasilotti]

2 comments + we might need a developer-facing feature flag vs. a business-facing one. That way we can enable collection before it is presented in the UI.

Future PRs:

1. Text search should search specialties, too
2. Autocomplete/combobox filtering
3. Alias/synonym support for specialties
4. Announce feature to developers (email)
5. Announce feature to businesses (blog post + email)