Add GitHub issue forms for bugs and features

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug report
+description: Create a report to help us fix problems
+labels:
+  - bug
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: >-
+        Describe the problem. What is happening? What did you expect to happen
+        instead? Screenshots and videos are welcome.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to reproduce
+      description: If we want to experience this bug for ourselves, what should we do?
+      placeholder: >-
+        Step 1. Go to dsek.se/booking.
+        Step 2. ...
+        Step 3. ...
+  - type: textarea
+    id: other
+    attributes:
+      label: Further information
+      description: Anything else we should know?

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Account issues
+    url: https://www.dsek.se/info/contact
+    about: Are you having trouble with your account? Please contact us here instead.

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature Request
+description: Suggest an idea for this project
+labels:
+  - enhancement
+body:
+  - type: textarea
+    attributes:
+      label: Description
+      description: >-
+        A clear and concise description. Make sure to include any relevant
+        background. Why is this enhancement needed and who would it benefit?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Describe the solution you'd like
+      description: If you have a solution in mind, please describe it.
+  - type: textarea
+    attributes:
+      label: Describe alternatives you've considered
+      description: >-
+        Have you considered any alternative solutions or workarounds? How is
+        this need currently being addressed?