Replace Discord links with Upsun Community Forum (sites/platform)

[catplat]

Summary

• Adds community: https://community.upsun.com to sites/platform/config/_default/params.yaml
• Replaces all Discord references in sites/platform with the Upsun Community Forum link using the {{< vendor/url "community" ... >}} shortcode
• Updates the ## Discord section heading in get-support.md to ## Upsun Community Forum
• Removes the now-redundant hardcoded link to support.platform.sh/hc/en-us/community/topics

Files changed:

• sites/platform/config/_default/params.yaml
• sites/platform/src/_index.md
• sites/platform/src/learn/overview/get-support.md
• sites/platform/src/request-features/_index.md

Test plan

• Verify {{< vendor/url "community" ... >}} resolves to https://community.upsun.com on the platform site
• Confirm no remaining Discord references in sites/platform (excluding the Discord integration docs)

🤖 Generated with Claude Code

[anacidre]

Nice cleanup — the shortcode swaps and the stale support.platform.sh link removal all look correct. A few things to address:

1. Remove the discord key from params.yaml

We won't be using Discord going forward, so the discord: https://discord.gg/upsun entry in sites/platform/config/_default/params.yaml should be removed rather than kept alongside the new community key. Keeping it risks someone accidentally reusing it.

2. Awkward adjacent headings in get-support.md

After this PR, sites/platform/src/learn/overview/get-support.md has ## Upsun Community Forum immediately followed by ## Community. These should be merged or the second heading renamed to avoid confusion.

3. Upsun site needs the same treatment

sites/upsun still has Discord references in the equivalent files (e.g., get-support.md, request-features/_index.md). Please include those in this PR or open a follow-up.

Minor

• Good catch on the leading space fix in the get-support.md title.

[catplat]

@anacidre Latest commits should capture the the changes requested, plus a few changes.

[anacidre]

Looks good — all Discord references replaced with the Upsun Community Forum. Removed the redundant second button in the community-buttons shortcode.