chore: setup markdown formatting (#3224)

* chore(deps): upgrade prettier to v1.8.2

* chore: setup lint-docs script

* docs: add `<!-- prettier-ignore -->`s

* docs: format docs

* Revert "docs: format docs"

This reverts commit 6dba903987dddc498cb589ca311905f25b6aee53.

* chore(prettierrc): set `--no-prose-wrap`

* docs: format docs

* Revert "docs: format docs"

This reverts commit 139bd744b6921916be8fac4fa3bab83bae5d12df.

* docs: tweak

* docs: format docs

* chore: rename .prettierrc

* chore: rename back to .prettierrc

* chore: split out third-party

* refactor: fix linting

* chore: do not split out third-party on website

docs/install.md

@@ -15,7 +15,7 @@ You can install it globally if you like:
 yarn global add prettier
 ```
 
-*We're using `yarn` but you can use `npm` if you like:*
+_We're using `yarn` but you can use `npm` if you like:_
 
 ```
 npm install --save-dev --save-exact prettier
@@ -23,5 +23,4 @@ npm install --save-dev --save-exact prettier
 npm install --global prettier
 ```
 
-> We recommend pinning an exact version of prettier in your `package.json`
-> as we introduce stylistic changes in patch releases.
+> We recommend pinning an exact version of prettier in your `package.json` as we introduce stylistic changes in patch releases.