Colour refactored to use Alta's

[jpye-finch]

Apply Alta's colour tweaks.

• Updates Primary to OpenCRVS primary blue
• Replaces darken and lighten colours to hardcoded - to ensure accessbility
• Updates Pill colours
• Updates colour story to simplify and show primary and secondary colours

[github-actions]

Oops! Looks like you forgot to update the changelog. When updating CHANGELOG.md, please consider the following:

• Changelog is read by country implementors who might not always be familiar with all technical details of OpenCRVS. Keep language high-level, user friendly and avoid technical references to internals.
• Answer "What's new?", "Why was the change made?" and "Why should I care?" for each change.
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[naftis]

I think you can

cd packages/components
yarn remove polished

if we're not using it anymore

[naftis]

Do we have a plan or a ticket to remove these altogether later, or could they be removed now? We have a tendency not to clean up deprecated items so trying to push it going forwards.

Otherwise the pull request looks good to merge 👍