Add "Request a Repo" feature to the repos homepage

Add a GitHub issue template with a structured form for anyone to
request a public repository be added to the architecture docs.
Add a styled "Request a Repo" button in the site header nav that
links directly to the issue template.

Closes supermodeltools/arch-docs#13

Author: jonathanpopham

.github/ISSUE_TEMPLATE/request-repo.yml

@@ -0,0 +1,56 @@
+name: Request a Repository
+description: Request a public repository to be added to the architecture docs homepage
+title: "[Repo Request] "
+labels: ["repo-request"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting a repository! We'll review your request and add it if it's a good fit.
+
+  - type: input
+    id: repo_url
+    attributes:
+      label: Repository URL
+      description: Full GitHub URL of the public repository
+      placeholder: "https://github.com/owner/repo"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: category
+    attributes:
+      label: Category
+      description: Which category best fits this repo?
+      options:
+        - "Community"
+        - "Supermodel Open Source"
+    validations:
+      required: true
+
+  - type: input
+    id: pill_label
+    attributes:
+      label: Tag / Label
+      description: A short tag for the repo card (e.g. "Frontend", "Backend", "AI/ML", "DevOps")
+      placeholder: "Frontend"
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A one-line description of the repository
+      placeholder: "A fast, modern web framework for building APIs"
+    validations:
+      required: true
+
+  - type: textarea
+    id: reason
+    attributes:
+      label: Why should this repo be added?
+      description: Any additional context on why this repo would be a good addition
+      placeholder: "Popular project with complex architecture that would benefit from arch docs"
+    validations:
+      required: false

generate-index.go

@@ -196,6 +196,18 @@ a:focus-visible { outline: 2px solid var(--accent-light); outline-offset: 2px; b
 .site-nav { display: flex; gap: 16px; align-items: center; }
 .site-nav a { color: var(--text-muted); font-size: 14px; font-weight: 500; white-space: nowrap; }
 .site-nav a:hover { color: var(--text); text-decoration: none; }
+.request-btn {
+  color: var(--accent-light) !important;
+  border: 1px solid var(--accent);
+  border-radius: var(--radius);
+  padding: 6px 12px;
+  transition: background 0.2s, color 0.2s;
+}
+.request-btn:hover {
+  background: var(--accent);
+  color: #fff !important;
+  text-decoration: none !important;
+}
 .hero {
   padding: 64px 0 48px;
   text-align: center;
@@ -361,6 +373,7 @@ a:focus-visible { outline: 2px solid var(--accent-light); outline-offset: 2px; b
         <a href="https://supermodeltools.com">Website</a>
         <a href="https://github.com/supermodeltools">GitHub</a>
         <a href="https://x.com/supermodeltools">X</a>
+        <a href="https://github.com/supermodeltools/supermodeltools.github.io/issues/new?template=request-repo.yml" class="request-btn">+ Request a Repo</a>
       </nav>
     </div>
   </header>