feat: ability to lock colors in theme generator

[ak4zh]

Linked Issue

Closes #1888 (issue was already closed but not implemented)

Description

This pull request introduces a new feature that allows users to lock colors from randomization in the theme generator. The purpose of this pull request is to enhance the theme generation process by giving users more control over specific colors.

Changsets

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Checklist

Please read and apply all contribution requirements.

• This PR targets the dev branch (NEVER master)
• Documentation reflects all relevant changes
• Branch is prefixed with: docs/, feat/, chore/, bugfix/
• Ensure Svelte and Typescript linting is current - run pnpm check
• Ensure Prettier linting is current - run pnpm format
• All test cases are passing - run pnpm test
• Includes a changeset (if relevant; see above)

[changeset-bot]

🦋 Changeset detected

Latest commit: da0fbbc

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

This PR includes changesets to release 1 package

Name	Type
skeleton.dev	Patch

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Name	Status	Preview	Updated (UTC)
skeleton-docs	✅ Ready (Inspect)	Visit Preview	Aug 23, 2023 9:52am

[ak4zh]

We need to review the accessibility rating part a bit, it seems the emoji is not centered.

[niktek]

Hi @ak4zh ,

Looks like we have a rendering issue for Firefox@latest with the lock not showing - can you pleas have a look into this.