Remove DesignKit package

[pixlwave]

This PR deletes the old DesignKit package and removes the use of the legacy element-design-tokens dependency.

• The button styles are now part of Compound.
• The text style has been moved to the Authentication module as that is its only use.
• The brand colour has been added locally for now until it's included in Compound.

[github-actions]

	Warnings
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.
⚠️	You seem to have made changes to views. Please consider adding screenshots.

Generated by 🚫 Danger Swift against 647724b

[stefanceriu]

Yey! 👏

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (6791a95) 70.93% compared to head (647724b) 70.92%.
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1886      +/-   ##
===========================================
- Coverage    70.93%   70.92%   -0.02%     
===========================================
  Files          461      462       +1     
  Lines        31197    31305     +108     
  Branches     15253    15283      +30     
===========================================
+ Hits         22131    22202      +71     
- Misses        8506     8536      +30     
- Partials       560      567       +7     

Flag	Coverage Δ
unittests	54.74% <71.69%> (+0.09%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...ources/Other/SwiftUI/Layout/FullscreenDialog.swift	72.80% <100.00%> (ø)
...s/Other/SwiftUI/Views/PlaceholderAvatarImage.swift	98.18% <ø> (ø)
...yticsPromptScreen/View/AnalyticsPromptScreen.swift	98.66% <100.00%> (ø)
.../Authentication/LoginScreen/View/LoginScreen.swift	96.74% <100.00%> (ø)
...irmationScreen/View/ServerConfirmationScreen.swift	100.00% <100.00%> (ø)
...erSelectionScreen/View/ServerSelectionScreen.swift	97.40% <100.00%> (ø)
...ation/SoftLogoutScreen/View/SoftLogoutScreen.swift	90.60% <100.00%> (ø)
...ntication/WaitlistScreen/View/WaitlistScreen.swift	94.73% <100.00%> (ø)
...ces/Screens/CreateRoom/View/CreateRoomScreen.swift	85.50% <100.00%> (ø)
...Screens/InvitesScreen/View/InvitesScreenCell.swift	96.42% <100.00%> (ø)
... and 10 more

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