Fix next warnings when building starter project

[mikemaccana]

Fix most next warnings when building starter project:

• next-compose-plugins is no longer maintained so get along without it.
• There's one remaining error re: modifyVars but add a link to the upstream issue.
• Use variables for the colors rather than magic numbers.

[changeset-bot]

🦋 Changeset detected

Latest commit: ee7c65e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@solana/wallet-adapter-example	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[socket-security]

New dependency changes detected. Learn more about Socket for GitHub ↗︎

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👍 No new dependency issues detected in pull request

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Pull request alert summary

Issue	Status
Install scripts	✅ 0 issues
Native code	✅ 0 issues
Bin script shell injection	✅ 0 issues
Unresolved require	✅ 0 issues
Invalid package.json	✅ 0 issues
HTTP dependency	✅ 0 issues
Git dependency	✅ 0 issues
Potential typo squat	✅ 0 issues
Known Malware	✅ 0 issues
Telemetry	✅ 0 issues
Protestware/Troll package	✅ 0 issues

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📊 Modified Dependency Overview:

🚮 Removed packages: next-compose-plugins@2.2.1

[mikemaccana]

I've added a changeset as instructed.

[jordaaash]

LGTM!

[mikemaccana]

Thanks! Check out #761 when you get a sec too, I’ve scaled it way back so it should hopefully be more usable.