Update palette colours

[ab-gnm]

Description

Updates palette colours based on @akemitakagi 's feedback document.

I've left the opinion_300 in but marked it as deprecated with recommendation to use 400 instead.

Also added a sheet with all palette pills to the sample app (screenshot below).

Testing notes/instructions:

Build and run the sample app to see all the palette colours, and maybe confirm them with Akemi's sheet.

Checklist

• Changes have been checked by the developer
• Changes have been checked by the reviewers
• Unit tested

Recommended reviewiers

• Design review for UI changes from @guardian/design-system
• Code review from @guardian/android-developers or @guardian/ios-developers
• Optional code/API review from @guardian/client-side-infra

For pull requests introducing UI changes:

• Sign-off by Design: @akemitakagi
• Dark Mode
• Tablet
• Accessibility (e.g. VoiceOver):

Screenshots or videos:

[ab-gnm]

Changes in this file are to create a bottom sheet scaffold. The bottom sheet is used to display the palette when "Open Palette" button is clicked.

[ab-gnm]

Colour changes are in this file.

[ab-gnm]

Added this xml file from news app and updated colours in it too. This will replace the file in source module in the news app.

[akemitakagi]

Hi Adi,

All the colours look good apart from the opinion of 300 and missing Special Report and Special Report Alt colours.

• opinion.300 is deprecated.
  If there are existing components using opinion.300, we suggest to use opinion.400.

• I added the Special Report and Special Report Alt colours in the doc I shared.
  Please let me know if there is any questions.

https://docs.google.com/document/d/1chQ2EqUdkjvzqn8hHgAthCL84M-XWeQ2hQg0_BsrBsg/edit

[jamesmockett]

On web we have specialReport.450 and specialReport.700 which aren't included here. We also have a set of specialReportAlt colours. Are these deliberate omissions as they're not used in apps? (This is probably a question for @akemitakagi 😄)

[akemitakagi]

Hi @jamesmockett,
Yes, we have Special report and Special report Alt colours.
I was waiting for the confirmation of the final colours as there was confusion about the signed-off colours.

The Special report colours are correct in Source, so I will let Adi know about the additional colours.

[akemitakagi]

Hi @ab-gnm,
All the colours look good. Thank you!

[EnochHankombo92]

LGTM