feat: integrate tailwind-config-viewer

[rogden]

@atinux This PR (recreated as a draft PR) integrates https://github.com/rogden/tailwind-config-viewer to replace the current colors UI.

It is served via serverMiddleware so it does conflict with the app CSS. Adding the serverMiddleware only works outside of the build:before hook for some reason. When called within the hook, it results in a 404. Feel free to change as needed and reach out with any questions.

[codecov]

Codecov Report

Merging #232 (7e761a1) into master (954b54c) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #232   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           43        45    +2     
  Branches         9         9           
=========================================
+ Hits            43        45    +2     

Impacted Files	Coverage Δ
lib/module.js	100.00% <100.00%> (ø)

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