Use an issue form instead of an issue template, fix branch in pull request template

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -0,0 +1,109 @@
+name: 🛠️ Bug report
+description:  Let us know that something isn't working as intended
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Our bug tracker is ONLY for bugs. It is not for feature requests, questions, or comments.
+
+        Please fill out this template with all the information you have. We can't do much without
+        both the logs and a detailed description of what you've encountered. Please do your best!
+
+        Please note that this tracker is only for bugs. Please try these locations if you have a question or comment:
+
+          https://community.signalusers.org/
+          https://support.signal.org/
+          [email protected]
+  - type: checkboxes
+    id: guidelines
+    attributes:
+      label: "Guidelines"
+      description: "Search issues here: https://github.com/signalapp/Signal-Android/issues"
+      options:
+        - label: I have searched searched open and closed issues for duplicates
+          required: true
+        - label: I am submitting a bug report for existing functionality that does not work as intended
+          required: true
+        - label: I have read https://github.com/signalapp/Signal-Android/wiki/Submitting-useful-bug-reports
+          required: true
+        - label: This isn't a feature request or a discussion topic
+          required: true
+  - type: textarea
+    id: description-of-bug
+    attributes:
+      label: Bug description
+      description: A clear and concise description of what the problem is that made you submit this report.
+      placeholder: When trying to do this, then...
+    validations:
+      required: true
+  - type: textarea
+    id: steps-to-reproduce
+    attributes:
+      label: Steps to reproduce
+      description: List the steps to reproduce the issue you are encountering.
+      placeholder: |
+        1. Go to any chat.
+        2. Do thing A.
+        3. Do thing B.
+        4. Things look off.
+    validations:
+      required: true
+  - type: textarea
+    id: expected-result
+    attributes:
+      label: Expected result
+      description: Describe in detail what the correct behavior should be.
+      placeholder: It would display things correctly.
+    validations:
+      required: true
+  - type: textarea
+    id: actual-result
+    attributes:
+      label: Actual result
+      description: Describe the details of the buggy behavior.
+      placeholder: "It fails and displays the following error:"
+    validations:
+      required: true
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots
+      description: "How to take screenshots on Android: https://support.google.com/android/answer/9075928"
+      placeholder: You can drag and drop images into this text box.
+    validations:
+      required: false
+  - type: input
+    id: device-model
+    attributes:
+      label: Device
+      description: Usually located in system settings -> About Phone
+      placeholder: Manufacturer and model
+    validations:
+      required: true
+  - type: input
+    id: android-version
+    attributes:
+      label: Android version
+      description: Usually located in system settings -> About Phone
+      placeholder: "14"
+    validations:
+      required: true
+  - type: input
+    id: signal-version
+    attributes:
+      label: Signal version
+      description: You can see Signal's version number at Settings -> Help
+      placeholder: 7.17.6
+    validations:
+      required: true
+  - type: textarea
+    id: debug-log
+    attributes:
+      label: Link to debug log
+      description: |
+        Immediately after the bug has happened, submit a debug log via Settings -> Help -> Debug Log, then copy that URL here.
+        See https://support.signal.org/hc/en-us/articles/360007318591#android_debug
+      placeholder: Paste your link or debug log file here.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

@@ -1,6 +1,6 @@
 blank_issues_enabled: false
 contact_links:
-  - name: 📃Support Center
+  - name: 📃 Support Center
     url: https://support.signal.org/
     about: Find answers to many common questions.
   - name: ✨ Feature request

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,7 +1,7 @@
 <!-- You can remove this first section if you have contributed before -->
 ### First time contributor checklist
 <!-- replace the empty checkboxes [ ] below with checked ones [x] accordingly -->
-- [ ] I have read [how to contribute](https://github.com/signalapp/Signal-Android/blob/master/CONTRIBUTING.md) to this project
+- [ ] I have read [how to contribute](https://github.com/signalapp/Signal-Android/blob/main/CONTRIBUTING.md) to this project
 - [ ] I have signed the [Contributor License Agreement](https://signal.org/cla/)
 
 ### Contributor checklist