Allow staring and unstarring repos within the repo details page

[oSumAtrIX]

Closes #30

Todo

• [x] Set clickable role
• [x] Add color fading

Review

• [x] Ensure code quality and conventions
• [x] Ensure correct change of ReopDetails GraphQL schema

[oSumAtrIX]

@wingio Can you clarify what the missing "color fading" is?

[wingio]

lines 49, 57, and 65 in LargeSegmentedButton.kt need to have .copy(alpha = 0.5f) appended to them when disabled