meta: Add issue templates (#782)

.github/ISSUE_TEMPLATE/1-bug-report.yml

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+name: "🐛 Bug Report"
+description: Report a bug found while using Planka
+title: "[Bug]: "
+labels: ["Type: Bug", "Status: Triage"]
+body:
+  - type: dropdown
+    id: issue-type
+    attributes:
+      label: Where is the problem occurring?
+      description: Select the part of the application where you encountered the issue.
+      options:
+        - "I encountered the problem while using the application (Frontend)"
+        - "I encountered the problem while interacting with the server (Backend)"
+        - "I'm not sure"
+  - type: dropdown
+    id: browsers
+    attributes:
+      label: What browsers are you seeing the problem on?
+      multiple: true
+      options:
+        - Brave
+        - Chrome
+        - Firefox
+        - Microsoft Edge
+        - Safari
+        - Other
+  - type: textarea
+    id: current-behavior
+    attributes:
+      label: Current behaviour
+      description: A description of what is currently happening, including screenshots and other useful information (**DO NOT INCLUDE PRIVATE INFORMATION**).
+      placeholder: Currently...
+    validations:
+      required: true
+  - type: textarea
+    id: desired-behavior
+    attributes:
+      label: Desired behaviour
+      description: A clear description of what you think should happen.
+      placeholder: In this situation, I expected ...
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Steps to reproduce
+      description: Clearly describe which steps or actions you have taken to arrive at the problem. If you have some experience with the code, please link to the specific pieces of code.
+      placeholder: I did X, then Y, before arriving at Z, when ERROR ...
+    validations:
+      required: true
+  - type: textarea
+    id: other
+    attributes:
+      label: Other information
+      description: Any other details?

.github/ISSUE_TEMPLATE/2-feature-request.yml

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+name: "✨ Feature Request"
+description: Suggest a feature or enhancement to improve Planka.
+labels: ["Type: Idea"]
+body:
+  -   type: dropdown
+      id: idea-type
+      attributes:
+        label: Is this a feature for the backend or frontend?
+        multiple: true
+        options:
+          - Backend
+          - Frontend
+      validations:
+        required: true
+  -   type: textarea
+      id: feature
+      attributes:
+        label: What would you like?
+        description: A clear description of the feature or enhancement wanted.
+        placeholder: I'd like to be able to...
+      validations:
+        required: true
+  -   type: textarea
+      id: reason
+      attributes:
+        label: Why is this needed?
+        description: A clear description of why this would be useful to have.
+        placeholder: I want this because...
+  -   type: textarea
+      id: other
+      attributes:
+        label: Other information
+        placeholder: Any other details?