.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.
+        option:
+          - 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
+
+        option:
+          - 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 at [email protected] or visit our help center
+      at https://mullvad.net/help instead of filing an issue.
+    url: https://mullvad.net/help