v1.0.0 README tweaks

[austin-denoble]

Problem

There's a couple minor things we want to tweak in the README before releasing v1.

Solution

• Update the metadataMap code in the Query by Vector Values example to the correct syntax.
• Add a few more links to the Support section for the community forums and GitHub issues.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

Test Plan

Check out the README.