refactor: move rules and variables to themes/teams

[levithomason]

This is a breakout of #16:

Changes

1. Rules and variables were moved to src/themes/teams/components.
2. Rules were renamed to Styles for easier understanding.

Fixes

1. Text styles were directly importing siteVariables, which is not allowed. The textVariables were updated to compose the siteVariables. Now, textStyles simply uses the textVariables it receives as part of its argument.

2. ListItem variables were defined in listVariables. Those have been moved to listItemVariables. The redundant item* prefixes were removed from the variable names.

Changelog

No entry as this is a refactor that does not affect consumers.

[codecov]

Codecov Report

Merging #57 into master will decrease coverage by 1.04%.
The diff coverage is 84.25%.

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
- Coverage   86.92%   85.88%   -1.05%     
==========================================
  Files          75       74       -1     
  Lines        1178     1098      -80     
  Branches      215      224       +9     
==========================================
- Hits         1024      943      -81     
- Misses        148      149       +1     
  Partials        6        6

Impacted Files	Coverage Δ
.../themes/teams/components/Avatar/avatarVariables.ts	100% <ø> (ø)
...mes/teams/components/Icon/fontAwesomeIconStyles.ts	80% <ø> (ø)
...emes/teams/components/Chat/chatMessageVariables.ts	100% <ø> (ø)
.../components/Accordion/accordionContentVariables.ts	25% <ø> (ø)
src/themes/teams/components/Menu/menuVariables.ts	100% <ø> (ø)
...hemes/teams/components/Divider/dividerVariables.ts	100% <ø> (ø)
src/components/Provider/Provider.tsx	58.33% <ø> (ø)	⬆️
src/themes/teams/components/Header/headerStyles.ts	100% <ø> (ø)
src/components/Chat/Chat.tsx	95.23% <100%> (ø)	⬆️
...c/themes/teams/components/Divider/dividerStyles.ts	70.58% <100%> (ø)
... and 49 more

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[levithomason]

Note, renderRule is part of the fela API, hence, it is not changed.

[alinais]

Looks good to me.