Support main.tsx and make main.css optional

[agubler]

Enhancement

Sniffs the projects main file to determine whether to load .ts or .tsx for the entry point. Also makes the main.css optional.

[codecov]

Codecov Report

Merging #175 into master will increase coverage by 0.06%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #175      +/-   ##
==========================================
+ Coverage   54.77%   54.84%   +0.06%     
==========================================
  Files          10       10              
  Lines         544      547       +3     
  Branches      125      127       +2     
==========================================
+ Hits          298      300       +2     
- Misses        246      247       +1

Impacted Files	Coverage Δ
src/base.config.ts	26.47% <75%> (+0.9%)	⬆️

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