release/1.7.0: release candidate 1 installs (doc and site config)

[climbfuji]

Summary

Update of documentation and site configs for 1.7.0 release candidate 1 installation on Discover, Hercules, Narwhal, NOAA ParallelWorks Gcloud (JCSDA).

Also update project_charter.md with new environment names.

Testing

These installations haven't been tested yet. This is going to happen in the next days / the next week before we finalize the release code.

Applications affected

n/a

Systems affected

See above

Dependencies

n/a

Issue(s) addressed

n/a

Checklist

• This PR addresses one issue/problem/enhancement, or has a very good reason for not doing so.
• These changes have been tested on the affected systems and applications. (in a sense that the install went through)
• All dependency PRs/issues have been resolved and this PR can be merged.