Remove frontend CHC related code

[joanagmaia]

Changes proposed ✍️

• Deleted CHC frontend code
• Deleted premium/communit-help-center folder that had the code for https://open.crowd.dev/
• Update pricing page
• Fix active tabs in settings page on load

What

🤖 Generated by Copilot at 9ff3db0

This pull request removes all the code and UI related to the community help center feature, which is deprecated and no longer supported. It deletes several files, localization strings, feature flags, menu items, and achievements that were associated with this feature.
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🤖 Generated by Copilot at 9ff3db0

community help
feature is deprecated
falling leaves of code

Why

How

🤖 Generated by Copilot at 9ff3db0

• Remove all code related to the deprecated community help center feature (link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link)

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screehshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.