Migrate elevation simple

[willum070]

This PR migrates the elevation-simple sample, and updates it to use all of our current standards.
It also includes an updated package-lock.json which should bring things in sync for the entire repo.

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• samples/elevation-simple/index.html:7, tag maps_elevation_simple
• samples/elevation-simple/index.ts:7, tag maps_elevation_simple
• samples/elevation-simple/style.css:6, tag maps_elevation_simple

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