Switch Google Health Trends and Google Symptoms inactive/active marking

[nmdefries]

Summary:

Mark Google Health Trends as inactive. Rename Google symptoms page. Make all headers have the same format (nav_order in the same place).

Prerequisites:

• Unless it is a documentation hotfix it should be merged against the dev branch
• Branch is up-to-date with the branch to be merged with, i.e. dev
• Build is successful
• Code is cleaned up and formatted

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[nmdefries]

The Covidcast data source pages are no longer ordered alphabetically. Nothing we changed here or in #1500 should have changed that (everything at the same nav order is sorted automatically) so the behavior should match that in production. Maybe this is a local issue? It's not intrusive, so will look into this later if it continues to be a problem.

[nmdefries]

Ah, apparently "The order of pages with equal nav_order parameters is unstable: it may change with each build" (theme docs).

[nmdefries]

I'll work on alphabetization in another PR, so this is ready to review, @tinatownes.

[tinatownes]

The changes here look good. I'll see "Alphabetize reordered data source menu #1539" for alphabetization edits. Thanks!