Organize project index with categorized sections

- Group projects into logical categories: Web Applications, ChatGPT Custom GPTs, Resources & Curations, Development Tools, and Blog & Personal
- Add three new ChatGPT Custom GPTs: eferro Lean Delivery, eferro Lean Discovery, and Thinkie Agent
- Improve navigation and discoverability of different project types
- Maintain existing functionality while enhancing organization

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: eferro

index.html

@@ -18,34 +18,65 @@ <h1 class="title">eferro Projects</h1>
     </header>
 
     <nav class="links">
-      <a class="card" href="https://eferro.github.io/eferro-picks-site/" target="_blank" rel="noopener noreferrer">
-        <span class="card-title">eferro Picks</span>
-        <span class="card-desc">Curated links and recommendations</span>
-      </a>
-      <a class="card" href="https://eferro.github.io/simplecalendar/" target="_blank" rel="noopener noreferrer">
-        <span class="card-title">SimpleCalendar</span>
-        <span class="card-desc">Simple, minimalist calendar</span>
-      </a>
-      <a class="card" href="https://eferro.github.io/focus/" target="_blank" rel="noopener noreferrer">
-        <span class="card-title">Focus</span>
-        <span class="card-desc">Pomodoro / distraction-free focus</span>
-      </a>
-      <a class="card" href="https://eferro.github.io/lean-prompt-garden/" target="_blank" rel="noopener noreferrer">
-        <span class="card-title">Lean Prompt Garden</span>
-        <span class="card-desc">Curated list of Prompt for Augmented coding</span>
-      </a>
-      <a class="card" href="https://g.co/gemini/share/6d9927b112ad" target="_blank" rel="noopener noreferrer">
-        <span class="card-title">Interactive Data Analysis App</span>
-        <span class="card-desc">Interactive data analysis tool built with Gemini</span>
-      </a>
-      <a class="card" href="https://github.com/eferro/k8s-memory-watch" target="_blank" rel="noopener noreferrer">
-        <span class="card-title">k8s-memory-watch</span>
-        <span class="card-desc">Kubernetes memory monitoring and alerting tool</span>
-      </a>
-      <a class="card" href="https://www.eferro.net/" target="_blank" rel="noopener noreferrer">
-        <span class="card-title">Blog / Personal website</span>
-        <span class="card-desc">eferro.net</span>
-      </a>
+      <section class="section">
+        <h2 class="section-title">Web Applications</h2>
+        <a class="card" href="https://eferro.github.io/simplecalendar/" target="_blank" rel="noopener noreferrer">
+          <span class="card-title">SimpleCalendar</span>
+          <span class="card-desc">Simple, minimalist calendar</span>
+        </a>
+        <a class="card" href="https://eferro.github.io/focus/" target="_blank" rel="noopener noreferrer">
+          <span class="card-title">Focus</span>
+          <span class="card-desc">Pomodoro / distraction-free focus</span>
+        </a>
+        <a class="card" href="https://g.co/gemini/share/6d9927b112ad" target="_blank" rel="noopener noreferrer">
+          <span class="card-title">Interactive Data Analysis App</span>
+          <span class="card-desc">Interactive data analysis tool built with Gemini</span>
+        </a>
+      </section>
+
+      <section class="section">
+        <h2 class="section-title">ChatGPT Custom GPTs</h2>
+        <a class="card" href="https://chatgpt.com/g/g-681225ecea248191aa52a038f2689358-eferro-lean-delivery" target="_blank" rel="noopener noreferrer">
+          <span class="card-title">eferro Lean Delivery</span>
+          <span class="card-desc">ChatGPT GPT for delivering value in smallest, safest steps</span>
+        </a>
+        <a class="card" href="https://chatgpt.com/g/g-687420ffb0d88191a8f16d4ad02b3353-eferro-lean-discovery" target="_blank" rel="noopener noreferrer">
+          <span class="card-title">eferro Lean Discovery</span>
+          <span class="card-desc">Turn fuzzy ideas into validated product bets</span>
+        </a>
+        <a class="card" href="https://chatgpt.com/g/g-6860ec93709c81919755df0152c1970c-thinkie-agent-with-kent-beck-s-thinkies" target="_blank" rel="noopener noreferrer">
+          <span class="card-title">Thinkie Agent (with Kent Beck's Thinkies)</span>
+          <span class="card-desc">Creative thinking tool using Kent Beck's habits of thought</span>
+        </a>
+      </section>
+
+      <section class="section">
+        <h2 class="section-title">Resources & Curations</h2>
+        <a class="card" href="https://eferro.github.io/eferro-picks-site/" target="_blank" rel="noopener noreferrer">
+          <span class="card-title">eferro Picks</span>
+          <span class="card-desc">Curated links and recommendations</span>
+        </a>
+        <a class="card" href="https://eferro.github.io/lean-prompt-garden/" target="_blank" rel="noopener noreferrer">
+          <span class="card-title">Lean Prompt Garden</span>
+          <span class="card-desc">Curated list of Prompt for Augmented coding</span>
+        </a>
+      </section>
+
+      <section class="section">
+        <h2 class="section-title">Development Tools</h2>
+        <a class="card" href="https://github.com/eferro/k8s-memory-watch" target="_blank" rel="noopener noreferrer">
+          <span class="card-title">k8s-memory-watch</span>
+          <span class="card-desc">Kubernetes memory monitoring and alerting tool</span>
+        </a>
+      </section>
+
+      <section class="section">
+        <h2 class="section-title">Blog & Personal</h2>
+        <a class="card" href="https://www.eferro.net/" target="_blank" rel="noopener noreferrer">
+          <span class="card-title">Blog / Personal website</span>
+          <span class="card-desc">eferro.net</span>
+        </a>
+      </section>
     </nav>
 
     <footer class="footer">