refactor: update prettier and doctoc (#5605)

* docs: add toc to CODE OF CONDUCT

* chore: add prettier ignore blocks to docs

* chore: update styles for Dockerfile

* refactor: separate prettier, doctoc

This does a couple things:
- update `.prettierignore`
- split `prettier` and `doctoc` commands. you can still run with `yarn
  fmt`
- delete `fmt.sh` and add `doctoc.sh`

By doing so, we can run tasks in parallel in CI and we should also have
less false positives than before with `yarn fmt` locally.

* refactor: update prettier job, add doctoc

This modifies the prettier job to use actionsx/prettier. It also adds a
job for `doctoc`.

* chore: upgrade to prettier 2.7.1

* chore: pin doctoc to 2.0.0

* fixup!: add .pc to prettierignore

* feat: add --cache to prettier cmd

ci/dev/doctoc.sh

@@ -4,24 +4,6 @@ set -euo pipefail
 main() {
   cd "$(dirname "$0")/../.."
 
-  local prettierExts
-  prettierExts=(
-    "*.js"
-    "*.ts"
-    "*.tsx"
-    "*.html"
-    "*.json"
-    "*.css"
-    "*.md"
-    "*.toml"
-    "*.yaml"
-    "*.yml"
-    "*.sh"
-  )
-  prettier --write --loglevel=warn $(
-    git ls-files "${prettierExts[@]}" | grep -v "lib/vscode" | grep -v 'helm-chart'
-  )
-
   doctoc --title '# FAQ' docs/FAQ.md > /dev/null
   doctoc --title '# Setup Guide' docs/guide.md > /dev/null
   doctoc --title '# Install' docs/install.md > /dev/null
@@ -32,12 +14,11 @@ main() {
   doctoc --title '# iPad' docs/ipad.md > /dev/null
   doctoc --title '# Termux' docs/termux.md > /dev/null
 
-  # TODO: replace with a method that generates fewer false positives.
   if [[ ${CI-} && $(git ls-files --other --modified --exclude-standard) ]]; then
     echo "Files need generation or are formatted incorrectly:"
     git -c color.ui=always status | grep --color=no '\[31m'
     echo "Please run the following locally:"
-    echo "  yarn fmt"
+    echo "  yarn doctoc"
     exit 1
   fi
 }