chore(.github): add probot configurations (#2491)

.github/config.yml

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+#
+# new-issue-welcome
+# https://github.com/behaviorbot/new-issue-welcome
+#
+
+# Comment to be posted to on first time issues
+newIssueWelcomeComment: |
+  👋 Thanks for opening your first issue here! If you're reporting a 🐞 bug, please make sure you've completed all the fields in the issue template so we can best help.
+
+  We get a lot of issues on this repo, so please be patient and we will get back to you as soon as we can.
+
+#
+# new-pr-welcome
+# https://github.com/behaviorbot/new-pr-welcome
+#
+
+# Comment to be posted to on PRs from first time contributors in your repository
+newPRWelcomeComment: |
+  💖 Thanks for opening this pull request! 💖
+
+  Here is a list of things that will help get it across the finish line:
+  - Run `yarn lint` locally to catch formatting errors. This will fix some errors automatically, commit and push any changes.
+  - Run `yarn test` locally to catch errors.  This ensures all components still behave as they should.
+  - Run `yarn start` to run the doc site locally and try a few pages, ensuring everything is in good working order.
+  - Include tests when adding/changing behavior.
+
+  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.
+
+#
+# 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! 🎉🎉🎉
+
+  ![robot victory dance](https://media.giphy.com/media/tczJoRU7XwBS8/giphy.gif)
+
+#
+# lock-threads
+# https://github.com/dessant/lock-threads
+#
+
+# Number of days of inactivity before a closed issue or pull request is locked
+daysUntilLock: 365
+
+# Comment to post before locking. Set to `false` to disable
+lockComment: >
+  This thread has been automatically locked because it has not had recent
+  activity. Please open a new issue for related bugs and link to relevant
+  comments in this thread.
+# Limit to only `issues` or `pulls`
+# only: issues

.github/stale.yml

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+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 90
+
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 30
+
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - pinned
+  - security
+
+# Label to use when marking an issue as stale
+staleLabel: stale
+
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed in 30 days if no further activity occurs.
+  Thank you for your contributions.
+
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false