Add issue templates

.github/ISSUE_TEMPLATE/compiler-bug.yml

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+name: 🐞 Compiler Bug Report
+description: For bugs of the Typst compiler
+title: Write a short and descriptive title!
+labels:
+  - bug
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for reporting a bug on the Typst compiler. Did you [take a look](https://github.com/typst/typst/issues?q=is%3Aopen+is%3Aissue+label%3Abug+-label%3A%22web+app%22) if your issue has already been filed? If so, join the discussion there!
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Please describe your issue. Include specific steps to reproduce it or a screenshot if the problem is with Typst's output.
+      placeholder: Terse and specific description of the bug. You can add a screenshot by dragging an image here.
+    validations:
+      required: true
+  - type: input
+    id: repro-url
+    attributes:
+      label: Reproduction URL
+      description: If your did not specify Typst code above, you can share a link to your typst.app project here
+      placeholder: https://typst.app/project/rU6j4Q5foiCcvB7Hz_gs9m
+    validations:
+      required: false
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating system
+      description: Which platform did you run the compiler on?
+      multiple: true
+      options:
+        - Web app
+        - Windows
+        - Linux
+        - macOS
+    validations:
+      required: false
+  - type: checkboxes
+    id: updated
+    attributes:
+      label: Typst version
+      description: Please check this box to confirm you are using the latest released version of Typst or an unreleased commit from this repository after the latest release.
+      options:
+        - label: I am using the latest version of Typst
+          required: false

.github/ISSUE_TEMPLATE/compiler-feature-request.yml

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+name: 🪴 Compiler Feature Request
+description: For feature request for the Typst compiler
+title: Write a short and descriptive title!
+labels:
+  - feature request
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for sharing your feature request for the Typst compiler. Did you [take a look](https://github.com/typst/typst/issues?q=is%3Aopen+is%3Aissue+label%3A%22feature+request%22+-label%3A%22web+app%22+) if a similar request has already been filed? If so, join the discussion there!
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Please describe your feature request. You can also add a mockup if you are requesting a new output feature!
+      placeholder: Terse and specific description of the feature. You can add an image by dragging a file here.
+    validations:
+      required: true
+  - type: textarea
+    id: use-case
+    attributes:
+      label: Use Case
+      description: Please describe why this feature would be useful.
+      placeholder: Describe what users can accomplish with this feature and whom it might be useful for.
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: 💬 Typst Discord
+    url: https://discord.gg/2uDybryKPe
+    about: Get answers to your questions about Typst on our Discord server
+  - name: 🗣️ Discussions on GitHub
+    url: https://github.com/typst/typst/discussions
+    about: Do you have a question instead of a specific bug or feature request? Open a discussion thread!

.github/ISSUE_TEMPLATE/web-app-bug-report.yml

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+name: 💻 Web App Bug Report
+description: For issues specific to https://typst.app
+title: Write a short and descriptive title!
+labels:
+  - bug
+  - web app
+assignees:
+  - reknih
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for reporting a bug on the Typst web app. Did you [take a look](https://github.com/typst/typst/issues?q=is%3Aopen+is%3Aissue+label%3A%22web+app%22+label%3Abug) if your issue has already been filed? If so, join the discussion there!
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Please describe your issue. Include specific steps to reproduce it or a screenshot if the problem is visual.
+      placeholder: Terse and specific description of the bug. You can add a screenshot by dragging an image here.
+    validations:
+      required: true
+  - type: input
+    id: repro-url
+    attributes:
+      label: Reproduction URL
+      description: If your issue involves a project and you did not specify Typst code above, you can share a link to your project here
+      placeholder: https://typst.app/project/rU6j4Q5foiCcvB7Hz_gs9m
+    validations:
+      required: false
+  - type: dropdown
+    id: browsers
+    attributes:
+      label: "Browsers"
+      description: What browsers are you seeing the problem on?
+      multiple: true
+      options:
+        - Firefox
+        - Chrome
+        - Safari
+        - Microsoft Edge
+        - Opera
+    validations:
+      required: false
+  - type: dropdown
+    id: os
+    attributes:
+      label: "OS"
+      description: Which operating system did you use?
+      multiple: true
+      options:
+        - Windows
+        - Linux
+        - macOS
+        - Android
+        - iOS or iPad OS
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/web-app-feature-request.yml

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+name: 🎁 Web App Feature Request
+description: For feature requests specific to https://typst.app
+title: Write a short and descriptive title!
+labels:
+  - feature request
+  - web app
+assignees:
+  - reknih
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for sharing your feature request for the Typst web app. Did you [take a look](https://github.com/typst/typst/issues?q=is%3Aopen+is%3Aissue+label%3Abug+label%3A%22feature+request%22) if a similar request has already been filed? If so, join the discussion there!
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Please describe your feature request. You can also add a mockup!
+      placeholder: Terse and specific description of the feature. You can add an image by dragging a file here.
+    validations:
+      required: true
+  - type: textarea
+    id: use-case
+    attributes:
+      label: Use Case
+      description: Please describe why this feature would be useful.
+      placeholder: Describe what users can accomplish with this feature and whom it might be useful for.
+    validations:
+      required: true