Document how to add new resources

[hedyhli]

Part of #497.

Added:

• A link to open an issue in the meta repo, with appropriate issue template, for viewers.
  • This is placed under the filter box when the filter box is on the left column (for tablets+)
  • For mobile, it is under the last resource item, because it doesn't make sense for this information to be presented to the user before they even see the list of resources.
  • Bulma classes clarification: https://bulma.io/documentation/helpers/visibility-helpers/#hide
• Docs in the readme with guidelines for the YAML files, for contributors.

Third point from the issue:

The review process for a new resource. Who reviews and approves these suggestions?

Is this necessary? Is there a review process we should document here?

I'll leave this for @swfarnsworth. [Discord message ref (staff chat)].

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[coveralls]

coverage: 100.0%. remained the same
when pulling 4099c02 on docs/suggest-resources
into 721aabe on main.

[jchristgit]

Sorry for the delay with reviews, this looks good to me!