.github: Add issue templates

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

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+---
+name: Reporting false positives
+description: This form is to report false positives in our DNS block lists.
+labels: 
+  - bug
+  - report
+
+body:
+
+  - type: markdown
+    attributes:
+      value: >
+        Thank you for wanting to help us improve our DNS block lists by reporting issues.
+
+  - type: checkboxes
+    id: reported-upstream
+    attributes:
+      label: Tried reporting upstream already?
+      description: >
+        If the URL you wish to report exists in an upstream block list,
+        ensure you have attempted to contact the repository owner directly.
+      options:
+        - label: I have attempted already, but to no avail.
+          required: true
+
+  - type: textarea
+    id: desired-urls
+    attributes:
+      label: What are the desired URLs to be unblocked?
+    validations:
+      required: true
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Information
+      description: Is there any additional information that you can provide?

.github/ISSUE_TEMPLATE/2-bug-further-support.yml

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+---
+name: More technical help required
+description: This form is to ask for extra support regarding our DNS block lists and DNS services
+labels: 
+  - support
+  - report
+
+body:
+
+  - type: markdown
+    attributes:
+      value: Thank you for wanting to help us improve our DNS services by reporting issues.
+
+  - type: checkboxes
+    id: asked-support-team
+    attributes:
+      label: Have you contacted the Support Team already?
+      description: >
+        The optimal course of action is to contact our Support Team by email.
+        Prior to asking a question about DNS server specifics, please ensure you troubleshoot
+        with them directly. https://mullvad.net/help
+      options:
+        - label: I have attempted already, but to no avail, or they pointed me here.
+          required: true
+
+  - type: textarea
+    id: issues-experienced
+    attributes:
+      label: What are the issues you need support with?
+    validations:
+      required: true
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Information
+      description: Is there any additional information that you can provide?

.github/ISSUE_TEMPLATE/config.yml

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+---
+blank_issues_enabled: false
+contact_links:
+  - name: Questions and issues not directly related to our DNS block lists
+    about: >
+      If your question is not related to our DNS block lists specifically,
+      please contact our Support Team by email or visit our help center
+      at https://mullvad.net/help instead of filing an issue.
+    url: https://mullvad.net/help