Update format script to format all files not ignored via `.prettier…

…ignore` that `prettier` has a valid parser for. (#768)

package.json

@@ -15,7 +15,7 @@
  "build:core": "lerna run build --scope astro --scope @astrojs/parser --scope @astrojs/markdown-support",
  "build:vscode": "lerna run build --scope astro-languageserver --scope astro-vscode --scope @astrojs/parser",
  "dev:vscode": "lerna run dev --scope astro-languageserver --scope astro-vscode --scope @astrojs/parser --parallel --stream",
- "format": "prettier -w \"**/*.{js,jsx,ts,tsx,md,json}\"",
+ "format": "prettier -w .",
  "lint": "eslint \"packages/**/*.ts\"",
  "test": "yarn workspace astro run test",
  "test:templates": "lerna run test --scope create-astro --stream"