Updated project README to include references to the new security policy.

Moved the project's code of conduct out of the contributions guide and into the appropriate policy file.

Updated the contribution guide to follow the NetBox project format.

Added various issue templates based on the NetBox project formats but updated for PDA.

Added additional GitHub workflows to handle stale and closed issue and PR management.

Removed legacy stale issue workflow that was not in use.

.github/ISSUE_TEMPLATE/documentation_change.yaml

@@ -0,0 +1,40 @@
+---
+name: 📖 Documentation Change
+description: Suggest an addition or modification to the PDA documentation
+labels: ["type: documentation"]
+body:
+  - type: dropdown
+    attributes:
+      label: Change Type
+      description: What type of change are you proposing?
+      options:
+        - Addition
+        - Correction
+        - Removal
+        - Cleanup (formatting, typos, etc.)
+    validations:
+      required: true
+  - type: dropdown
+    attributes:
+      label: Area
+      description: To what section of the documentation does this change primarily pertain?
+      options:
+        - Features
+        - Installation/upgrade
+        - Getting started
+        - Configuration
+        - Customization
+        - Database Setup
+        - Debug
+        - Integrations/API
+        - Administration
+        - Development
+        - Other
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Proposed Changes
+      description: Describe the proposed changes and why they are necessary.
+    validations:
+      required: true