Heading levels in guides

**Describe the bug**
Headings in guides are problematic—titles for pages that are dynamically getting pulled in are styling as H2, and so is the next heading level down. (See screenshot 3.) This makes sense on a standalone page, but not within a guide, which has two layers of headings above it—the guide title (H1), and the section title (which seems to be styling as an H1 but semantically doesn't make sense to me)

versus

Notes from https://github.com/cityofaustin/techstack/issues/2599#issuecomment-522774454:
- this is like a blog. Investigate how nested H2 tags work for screenreader
- instead of `div`, could use an `article`. What's ambiguous is article vs. section tag. #1257 is related to semantic html

**Acceptance criteria**
- [ ] tbd

**URL**

**To Reproduce**

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

**Current behavior**

**Expected behavior**

**Screenshots**

**Device**

**Browser**

**Additional context**