Move all docs to website (#3139)

* Sync README -> docs/options.md

* Sync README -> docs/*.md

* Misc fixups

* Remove markdown-toc

* Remove insert-pragma from ToC

* Never again!

* Move all docs to ./docs

* Remove yarn toc

* Fix inter-doc links

* Fix links in footer

* Clean up README.md

* Add basic description to README.md

* Use flat badges

* Move editor guides to website

* Improve prettier-ignore docs

* Fixup bad find/replace

* Add JSON to README

* Fix custom parser API link

* Fixup GitHub centering, add downloads badge

* Add 1.8 docs

* docs(website): mention markdown on homepage (#1)

* Add intro

* Add watching-files.md

* Fix markdown syntax highlighting

* Switch back to .md links

docs/precommit.md

@@ -0,0 +1,67 @@
+---
+id: precommit
+title: Pre-commit Hook
+---
+
+You can use Prettier with a pre-commit tool. This can re-format your files that are marked as "staged" via `git add` before you commit.
+
+## Option 1. [lint-staged](https://github.com/okonet/lint-staged)
+
+Install it along with [husky](https://github.com/typicode/husky):
+
+```bash
+yarn add lint-staged husky --dev
+```
+
+and add this config to your `package.json`:
+
+```json
+{
+  "scripts": {
+    "precommit": "lint-staged"
+  },
+  "lint-staged": {
+    "*.{js,json,css}": [
+      "prettier --write",
+      "git add"
+    ]
+  }
+}
+```
+There is a limitation where if you stage specific lines this approach will stage the whole file after regardless. See this [issue](https://github.com/okonet/lint-staged/issues/62) for more info.
+
+See https://github.com/okonet/lint-staged#configuration for more details about how you can configure lint-staged.
+
+
+## Option 2. [pre-commit](https://github.com/pre-commit/pre-commit)
+
+Copy the following config into your `.pre-commit-config.yaml` file:
+
+```yaml
+
+    -   repo: https://github.com/prettier/prettier
+        sha: ''  # Use the sha or tag you want to point at
+        hooks:
+        -   id: prettier
+
+```
+
+Find more info from [here](http://pre-commit.com).
+
+## Option 3. bash script
+
+Alternately you can save this script as `.git/hooks/pre-commit` and give it execute permission:
+
+```bash
+#!/bin/sh
+jsfiles=$(git diff --cached --name-only --diff-filter=ACM "*.js" "*.jsx" | tr '\n' ' ')
+[ -z "$jsfiles" ] && exit 0
+
+# Prettify all staged .js files
+echo "$jsfiles" | xargs ./node_modules/.bin/prettier --write
+
+# Add back the modified/prettified files to staging
+echo "$jsfiles" | xargs git add
+
+exit 0
+```