[@foal/cli] Refactor createapp command to generate files closest to an SPA.

[LoicPoullain]

Issue

See #231. Related to #279.

Solution and steps

• Disable CSRF by default.
• Remove the ViewController.
• Add an ApiController.
• Remove the app.*.json files to simplify the get started.
• Update the tutorials.

Checklist

• Add/update/check docs (code comments and docs/ folder).
• Add/update/check tests.
• Update/check the cli generators.

[codecov]

Codecov Report

Merging #315 into v0-7-3 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           v0-7-3     #315   +/-   ##
=======================================
  Coverage   99.73%   99.73%           
=======================================
  Files          45       45           
  Lines         751      751           
  Branches      149      149           
=======================================
  Hits          749      749           
  Misses          2        2

Impacted Files	Coverage Δ
packages/core/src/express/create-app.ts	98.27% <ø> (ø)	⬆️

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