Add templates for issues and PRs

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: "\U0001F41E Bug report"
+description: Report an issue with Flatbread
+labels: ['bug']
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    id: bug-description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is. If you intend to submit a PR for this issue, tell us in the description. Thanks!
+      placeholder: Bug description
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Reproduction
+      description: Please provide a link to a repo or REPL that can reproduce the problem you ran into. If a report is vague (e.g. just a generic error message) and has no reproduction, it will receive a "need reproduction" label. If no reproduction is provided within a reasonable time-frame, the issue will be closed.
+      placeholder: Reproduction
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs
+      description: 'Please include browser console / server logs around the time this bug occurred. Optional if provided reproduction. Please try not to insert an image, but copy paste the log text.'
+      render: shell
+  - type: textarea
+    id: system-info
+    attributes:
+      label: System Info
+      description: Output of `npx envinfo --system --npmPackages '{flatbread,@flatbread/*}' --binaries --browsers`
+      render: shell
+      placeholder: System, Binaries, Browsers
+    validations:
+      required: true
+  - type: dropdown
+    id: severity
+    attributes:
+      label: Severity
+      description: Select the severity of this issue
+      options:
+        - annoyance
+        - blocking an upgrade
+        - blocking all usage of Flatbread
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Slack channel
+    url: https://join.slack.com/t/flatbreadworkspace/shared_invite/zt-1bvnhr38j-oHFun85aGfaNp9qwizOORw
+    about: Ask questions and discuss with other Flatbread users in real time.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: 'Feature Request'
+description: Request a new Flatbread feature
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to request this feature! If your feature request is complex or substantial enough to warrant in-depth discussion, maintainers may close the issue and ask you to open a [discussion](https://github.com/FlatbreadLabs/flatbread/discussions/categories/ideas).
+  - type: textarea
+    id: problem
+    attributes:
+      label: Describe the problem
+      description: Please provide a clear and concise description the problem this feature would solve. The more information you can provide here, the better.
+      placeholder: I'm always frustrated when...
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Describe the proposed solution
+      description: Please provide a clear and concise description of what you would like to happen.
+      placeholder: I would like to see...
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: "Please provide a clear and concise description of any alternative solutions or features you've considered."
+    validations:
+      required: true
+  - type: dropdown
+    id: importance
+    attributes:
+      label: Importance
+      description: How important is this feature to you?
+      options:
+        - Nice to have
+        - Would make my life easier
+        - I cannot use Flatbread without it
+    validations:
+      required: true

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+**Summary of changes**
+
+<!-- This message body should clearly illustrate what problems it solves. -->
+
+Closes # <!-- It's really useful if your PR references an issue where it is discussed ahead of time. If this PR closes any issues, please list them here with a seperate `Closes #<issue-number>` line for each. If there are any related issues that this does not close, list them without the "Closes" prefix. -->
+
+### Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
+
+- [ ] I added doc comments to any new public exports, and inline comments to any hard-to-understand areas
+- [ ] My changes generate no new console errors locally
+- [ ] If applicable, try to include a test that fails without this PR but passes with it
+
+
+### Does this introduce any non-backwards compatible changes?
+
+- [ ] Yes
+- [ ] No
+
+### Does this include any user config changes?
+
+- [ ] Yes
+  - [ ] If so, I have updated the relevant areas of documentation
+- [ ] No