Chore: Add issue/pr template and general housekeeping tools and docs (#900)

* Add linting

* Add issue templates and docs

* Add root eslint config and remove tslint

* Autofix lint issues

packages/rrweb-player/package.json

@@ -6,11 +6,8 @@
     "@rollup/plugin-node-resolve": "^13.2.1",
     "@rollup/plugin-typescript": "^8.3.2",
     "@types/offscreencanvas": "^2019.6.4",
-    "@typescript-eslint/eslint-plugin": "^3.7.0",
-    "@typescript-eslint/parser": "^3.7.0",
-    "eslint": "^7.5.0",
-    "eslint-config-google": "^0.11.0",
-    "eslint-plugin-svelte3": "^2.7.3",
+    "eslint-config-google": "^0.14.0",
+    "eslint-plugin-svelte3": "^4.0.0",
     "postcss-easy-import": "^3.0.0",
     "rollup": "^2.71.1",
     "rollup-plugin-css-only": "^3.1.0",
@@ -35,7 +32,8 @@
     "prepublishOnly": "yarn build",
     "start": "sirv public",
     "validate": "svelte-check",
-    "prepublish": "yarn build"
+    "prepublish": "yarn build",
+    "lint": "yarn eslint src/**/*.ts"
   },
   "description": "rrweb's replayer UI",
   "main": "lib/index.js",