[chore] Remove type info from resource pages #929

[thompson-tomo]

Fixes #929

Changes

This removes the type field from resource documents as type is a concept for entities for which we have a dedicated registry documenting them.

Note: if the PR is touching an area that is not listed in the existing areas, or the area does not have sufficient domain experts coverage, the PR might be tagged as experts needed and move slowly until experts are identified.

Merge requirement checklist

• CONTRIBUTING.md guidelines followed.
• Change log entry added, according to the guidelines in When to add a changelog entry.
  • If your PR does not need a change log, start the PR title with [chore]
• Links to the prototypes or existing instrumentations (when adding or changing conventions)

[lmolkova]

The type was documented in https://github.com/open-telemetry/semantic-conventions/blob/main/docs/how-to-write-conventions/resource-and-entities.md after the original issue was created. It's an important property of the entity (analogous to metric or event name).

Closing this PR since the original issue is no longer relevant