Add issue templates

.gitea/issue_template/bug-report.yaml

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+name: "Bug Report"
+labels: ["Kind/Bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        - Before reporting an issue, please [take a moment to check that your issue hasn't been reported before](https://codeberg.org/avery42/delfin/issues).
+        - Please fill out all the relevant fields below - incomplete issues may be delayed or closed
+
+  - id: description
+    type: textarea
+    attributes:
+      label: Description
+      description: |
+        Please provide a detailed description of your issue.
+        Be descriptive, and provide the steps required to reproduce the issue if possible.
+      validations:
+        required: true
+
+  - id: screenshots
+    type: textarea
+    attributes:
+      label: Screenshots
+      description: If possible, provide screenshots of your issue.
+      validations:
+        required: false
+
+  - id: version
+    type: input
+    attributes:
+      label: Delfin Version
+      description: |
+        The version of Delfin that you're using.
+        You can find it in Delfin by opening the main menu near the top right, clicking on "About Delfin", and clicking on the blue version number to copy it.
+      validations:
+        required: true
+
+  - id: installed-from
+    type: dropdown
+    attributes:
+      label: How did you install Delfin?
+      options:
+        - "Flathub"
+        - "AUR"
+        - "Nix"
+        - "Compiled from source"
+        - "Other (please mention in description)"
+      validations:
+        required: true
+
+  - id: os
+    type: input
+    attributes:
+      label: Operating System/Distro
+      description: The operating system that you're running Delfin on
+      validations:
+        required: true

.gitea/issue_template/config.yaml

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+blank_issues_enabled: false