chore: Improve "Explore the docs" links in sidebar

[danielbachhuber]

Changes

• Adds Experiments to the set of links
• Uses the graph icon instead of trends for Product analytics
• Switches Feature flags color to that of the website

Before	After

How did you test this code?

Visual review.

[github-actions]

Size Change: 0 B

Total Size: 1.16 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	1.16 MB

_{compressed-size-action}

[posthog-bot]

📸 UI snapshots have been updated

2 snapshot changes in total. 0 added, 2 modified, 0 deleted:

• chromium: 0 added, 2 modified, 0 deleted (diff for shard 1)
• webkit: 0 added, 0 modified, 0 deleted

Triggered by this commit.

👉 Review this PR's diff of snapshots.