WDFN- 953 Multi Site In-page Navigation

Before making a pull request

• Put the appropriate EXEMPT flag if needed in the MR label (see https://practices.wma.chs.usgs.gov/practice/peer_code_review/)
• Run all linters (make lint)
• Run all tests (make test)
• Update the changelog appropriately
• If making a release, update code.json metadataLastUpdated and bump CHANGELOG.md to next version.

WDFN- 953 Multi Site In-page Navigation

Add USWDS In-page navigation to the Combined location graph page (multi-site hydrograph)

Changes the names and routes from multi-site hydrograph to Combined location graph

Most file changes are for the new name, the only files of real interest are in 'styles' and 'templates' folders

Image - Combined location graph page with in-page navigation

After making a pull request

• [] If appropriate, put the link to the PR in the JIRA ticket
• Assign someone to review unless the change is trivial
• Check the accessibility CI step and fix or explain any issues.