Add bug report template

Author: foosel

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: 🐛 Report a bug
+description: Help improve OctoPi-UpToDate by reporting observed bugs. Got a question or need support? See "Have questions or need support?" instead!
+body:
+  - type: markdown
+    attributes:
+      value: >
+
+        ### ✋ **This is bug tracker, not a support forum**
+
+
+        If something isn't working right, you have questions or need help, [**get in touch on the forums**](https://community.octoprint.org/c/support/).
+
+
+        Only proceed here if you are 100% sure the issue you are seeing is actually a bug in OctoPi-UpToDate's build scripts. If in doubt, check
+        in on the forums first, we can always file a bug from a support request later.
+  - type: dropdown
+    attributes:
+      label: What OctoPi-UpToDate modification is involved?
+      options:
+        - OctoPrint update
+        - Bootloader & Kernel update
+        - libcamera-apps update
+        - user-fix install
+        - octopi.txt fix
+        - build number write
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: The problem
+      description: >-
+        Describe the issue you are experiencing here. Tell us what you were trying to do
+        step by step, and what happened that you did not expect.
+
+        Provide a clear and concise description of what the problem is and include as many
+        details as possible.
+      placeholder: |
+        1. ...
+        2. ...
+        3. ...
+    validations:
+      required: true
+  - type: checkboxes
+    attributes:
+      label: Please confirm you have understood that you can ONLY report issues with the particular OctoPi-UpToDate build scripts here, not general OctoPrint or OctoPi issues.
+      options:
+        - label: I confirm that my issue is not about OctoPrint.
+          required: true
+        - label: I confirm that my issue is not about OctoPi.
+          required: true
+        - label: I confirm that my issue is only about OctoPi-UpToDate.
+          required: true
+  - type: textarea
+    attributes:
+      label: Additional information & file uploads

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 🤔 Have questions or need support?
+    url: https://community.octoprint.org
+    about: Please get in touch on the OctoPrint Community Forums!
+  - name: 💸 Want to donate?
+    url: https://support.octoprint.org
+    about: Please take a look at the various options to support OctoPrint's development financially!