feat: first-pass at Guides routes/page

[bodom0015]

Problem

We need a new page / set of pages to present Guides to the user

Our first guide will be Public Transit Equity

Fixes #318

Approach

• feat: copy existing PostLayout to use as a base for Guides section
• fix: cut some corners on author/last_updated/body to get the page to render
• feat: added carousel styling/behavior to homepage

How to Test

1. Navigate to https://deploy-preview-323--cheerful-treacle-913a24.netlify.app
2. Scroll down to the new carousel displaying SDOH factors (Transit, Greenspaces, Education, Workspaces, etc)
   • You should see a Learn More button here for "Transit"
3. Click on the "Transit" factor
   • You should be taken to the new guide on Public Transit Equity

[netlify[bot]]

✅ Deploy Preview for cheerful-treacle-913a24 ready!

Name	Link
🔨 Latest commit	b249a0050b2941073c26396572a663b1bd260825
🔍 Latest deploy log	https://app.netlify.com/sites/cheerful-treacle-913a24/deploys/6716739893970d0008791f24
😎 Deploy Preview	https://deploy-preview-323--cheerful-treacle-913a24.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.