Add and update GitHub repository configuration files (#7)

Introduce CODEOWNERS, Dependabot auto-merge workflow, and a
comprehensive GitHub settings guide. Update issue and pull request
templates for clarity and consistency. Enhance dependabot.yml with
improved grouping, scheduling, and labeling. Improve README formatting
and instructions.

## Description

Please include a summary of the change and which issue is fixed.

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] Documentation update

## Checklist

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with `make test`

Author: CharlesPoulin

.github/workflows/dependabot-auto-merge.yml

@@ -1,15 +1,25 @@
 name: Dependabot Auto-Merge
 
-on: pull_request
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
 
 permissions:
   contents: write
   pull-requests: write
 
+# Prevent multiple runs on the same PR
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
+  cancel-in-progress: false
+
 jobs:
   dependabot-auto-merge:
     runs-on: ubuntu-latest
-    if: github.actor == 'dependabot[bot]'
+    # Only run for Dependabot PRs that are not drafts
+    if: |
+      github.actor == 'dependabot[bot]' &&
+      github.event.pull_request.draft == false
 
     steps:
       - name: Fetch Dependabot metadata
@@ -34,11 +44,17 @@ jobs:
           PR_URL: ${{ github.event.pull_request.html_url }}
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Auto-merge patch and minor updates
+      - name: Enable auto-merge for patch updates
+        if: steps.metadata.outputs.update-type == 'version-update:semver-patch'
+        run: gh pr merge --auto --squash "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Enable auto-merge for minor dev dependency updates
         if: |
-          steps.metadata.outputs.update-type == 'version-update:semver-patch' ||
-          (steps.metadata.outputs.update-type == 'version-update:semver-minor' &&
-           steps.metadata.outputs.dependency-type == 'direct:development')
+          steps.metadata.outputs.update-type == 'version-update:semver-minor' &&
+          steps.metadata.outputs.dependency-type == 'direct:development'
         run: gh pr merge --auto --squash "$PR_URL"
         env:
           PR_URL: ${{ github.event.pull_request.html_url }}