Adds facebook and twitter cards to pages

[itsthejoker]

Relevant issue: #151

Description:

Adds card support for Twitter and Facebook. Uses the formatting developed for https://filamentcolors.xyz, which will translate nicely to what we need. This PR handles updating the title and body of the card depending on whether we're looking at a main page or a post detail.

Screenshots:

Checklist:

• [x] Code Quality
• [ ] Pep-8
• [ ] Tests (if applicable)
• [x] Success Criteria Met
• [ ] Inline Documentation
• [ ] Wiki Documentation (if applicable)