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

.github/config.yml

@@ -0,0 +1,19 @@
+# Comment to be posted to on PRs from first time contributors in your repository
+newPRWelcomeComment: |
+  💖 Thanks for opening this pull request! 💖
+
+  Things that will help get your PR across the finish line:
+
+  - Follow the TypeScript [coding style](https://github.com/rrweb-io/rrweb/blob/master/docs/development/coding-style.md).
+  - Run `yarn lint` locally to catch formatting errors earlier.
+  - Document any user-facing changes you've made following the [documentation styleguide](https://github.com/rrweb-io/rrweb/blob/master/blob/main/docs/styleguide.md).
+  - Include tests when adding/changing behavior.
+  - Include screenshots and animated GIFs whenever possible.
+
+  We get a lot of pull requests on this repo, so please be patient and we will get back to you as soon as we can.
+
+# Configuration for first-pr-merge - https://github.com/behaviorbot/first-pr-merge
+
+# Comment to be posted to on pull requests merged by a first time user
+firstPRMergeComment: >
+  Congrats on merging your first pull request! 🎉🎉🎉Hallo