Remove NSF badges from "what is next for qgreenland" discussion

[trey-stafford]

Description

These break the PDF build. The process hangs, waiting for user input:

! LaTeX Error: Unknown graphics extension: .svg.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...

l.2917 ...9b58e00623a9fa197/NSF-1928393-red}.svg}}
                                                  %
?

Checklist

If an item on this list is done or not needed, check it with [x] or click the
checkbox.

• The PR description links to issues that it resolves with closes #{issue_number}
• Config lockfile updated (inv config.export > qgreenland/config/cfg-lock.json)
• Environment lockfile updated if needed (conda-lock)
• Version bumped if needed (bumpversion (major|minor|patch|prerelease|build))
• CHANGELOG.md updated (for user-facing changes)
• Documentation updated if needed
• New unit tests if needed

[trey-stafford]

Issue to revisit: #762