Remove AOT (#5340)

* make `jit` mode the default when no mode is specified

* unify JIT and AOT codepaths

* ensure `Object.entries` on undefined doesn't break

It could be that sometimes you don't have values in your config (e.g.: `presets: []`), this in turn will break some plugins where we assume we have a value.

* drop AOT specific tests

These tests are all covered by JIT mode already and were AOT specific.

* simplify tests, and add a few

Some of the tests were written for AOT specifically, some were missing. We also updated the way we write those tests, essentially making Tailwind a blackbox, by testing against the final output.
Now that JIT mode is the default, this is super fast because we only generate what is used, instead of partially testing in a 3MB file or building it all, then purging.

* add some todo's to make sure we warn in a few cases

* make `darkMode: 'media'`, the default

This also includes moving dark mode tests to its own dedicated file.

* remove PostCSS 7 compat mode

* update CLI to be JIT-first

* fix integration tests

This is not a _real_ fix, but it does solve the broken test for now.

* warn when using @responsive or @variants

* remove the JIT preview warning

* remove AOT-only code paths

* remove all `mode: 'jit'` blocks

Also remove `variants: {}` since they are not useful in `JIT` mode
anymore.

* drop unused dependencies

* rename `purge` to `content`

* remove static CDN builds

* mark `--purge` as deprecated in the CLI

This will still work, but a warning will be printed and it won't show up
in the `--help` output.

* cleanup nesting plugin

We don't have to duplicate it anymore since there is no PostCSS 7
version anymore.

* make sure integration tests run in band

* cleanup folder structure

* make sure nesting folder is available

* simplify resolving of purge/content information

package.json

@@ -22,14 +22,12 @@
     "babelify": "babel src --out-dir lib --copy-files",
     "postbabelify": "ncc build lib/cli-peer-dependencies.js -o peers",
     "rebuild-fixtures": "npm run babelify && babel-node scripts/rebuildFixtures.js",
-    "prepublishOnly": "npm install --force && npm run babelify && babel-node scripts/build.js && node scripts/build-plugins.js",
+    "prepublishOnly": "npm install --force && npm run babelify",
     "style": "eslint .",
     "test": "cross-env TAILWIND_MODE=build jest",
     "test:integrations": "npm run test --prefix ./integrations",
     "install:integrations": "node scripts/install-integrations.js",
     "posttest": "npm run style",
-    "compat": "node scripts/compat.js --prepare",
-    "compat:restore": "node scripts/compat.js --restore",
     "generate:plugin-list": "babel-node scripts/create-plugin-list.js"
   },
   "files": [
@@ -52,7 +50,6 @@
     "@vercel/ncc": "^0.29.2",
     "autoprefixer": "^10.3.3",
     "babel-jest": "^27.0.6",
-    "clean-css": "5.1.4",
     "cross-env": "^7.0.3",
     "cssnano": "^5.0.8",
     "eslint": "^7.32.0",
@@ -71,7 +68,6 @@
   },
   "dependencies": {
     "arg": "^5.0.1",
-    "bytes": "^3.0.0",
     "chalk": "^4.1.2",
     "chokidar": "^3.5.2",
     "color": "^4.0.1",
@@ -80,14 +76,10 @@
     "didyoumean": "^1.2.2",
     "dlv": "^1.1.3",
     "fast-glob": "^3.2.7",
-    "fs-extra": "^10.0.0",
     "glob-parent": "^6.0.1",
-    "html-tags": "^3.1.0",
     "is-glob": "^4.0.1",
     "lodash": "^4.17.21",
-    "lodash.topath": "^4.5.2",
     "modern-normalize": "^1.1.0",
-    "node-emoji": "^1.11.0",
     "normalize-path": "^3.0.0",
     "object-hash": "^2.2.0",
     "postcss-js": "^3.0.3",
@@ -95,8 +87,6 @@
     "postcss-nested": "5.0.6",
     "postcss-selector-parser": "^6.0.6",
     "postcss-value-parser": "^4.1.0",
-    "pretty-hrtime": "^1.0.3",
-    "purgecss": "^4.0.3",
     "quick-lru": "^5.1.1",
     "reduce-css-calc": "^2.1.8",
     "resolve": "^1.20.0",