docs: add README banner, fix branch URL, site improvements

- README: add centered banner with Ubuntu/Bash/AGPL badges (do-manager style)
- README + index.html: fix download URL main -> stable
- README: fix --no-p10k-custom default off (was wrongly marked on)
- index.html: add GitHub link in nav and footer
- index.html: replace CIS stat with '60+ CLI flags'
- index.html: add --no-p10k-custom to Zsh options group
- index.html: move --steps/--no-emojis to new General options group

Author: franckferman

README.md

@@ -1,6 +1,14 @@
+<div align="center">
+
 # ubuntu-post-install
 
-A bash script that automates the setup of a fresh Ubuntu installation — system hardening, GNOME configuration, developer tooling, privacy settings, and optional third-party software.
+**A bash script that automates the setup of a fresh Ubuntu installation — system hardening, GNOME configuration, developer tooling, privacy settings, and optional third-party software.**
+
+[![Ubuntu](https://img.shields.io/badge/Ubuntu-22.04%20%7C%2024.04-E95420?style=flat-square&logo=ubuntu&logoColor=white)](https://ubuntu.com)
+[![Shell](https://img.shields.io/badge/shell-bash-4EAA25?style=flat-square&logo=gnubash&logoColor=white)](ubuntu-post-install.sh)
+[![License](https://img.shields.io/badge/license-AGPL--3.0-blue?style=flat-square)](LICENSE)
+
+</div>
 
 Designed for personal workstations and security-conscious desktops. Idempotent where possible: safe to run more than once, skips what is already done.
 
@@ -46,7 +54,7 @@ The script will not run as root directly. It calls `sudo` internally where neede
 
 ```bash
 # Download
-curl -O https://raw.githubusercontent.com/franckferman/ubuntu-post-install/main/ubuntu-post-install.sh
+curl -O https://raw.githubusercontent.com/franckferman/ubuntu-post-install/stable/ubuntu-post-install.sh
 
 # Review before running (always a good idea)
 less ubuntu-post-install.sh
@@ -265,7 +273,7 @@ Both `--firefox-hardened-profiles` and `--firefox-relaxed-profiles` must be subs
 |------|---------|-------------|
 | `--zsh-plugins-profile` | `default` | Plugin set depth (see script internals) |
 | `--p10k-preset <p>` | `classic` | Powerlevel10k prompt preset |
-| `--no-p10k-custom` | on | Skip custom p10k segment overrides |
+| `--no-p10k-custom` | off | Skip custom p10k segment overrides |
 | `--p10k-segments` | off | Apply extended segment configuration |
 
 Nerd Fonts (step 9) are required for Powerlevel10k glyphs to render correctly. If step 9 is skipped, use a pre-installed Nerd Font in your terminal emulator.

index.html

@@ -606,7 +606,13 @@
     <a href="#options">Options</a>
     <a href="#examples">Examples</a>
   </nav>
-  <a href="#quickstart" class="btn nav-cta">Get started →</a>
+  <div style="display:flex;gap:.6rem;align-items:center">
+    <a href="https://github.com/franckferman/ubuntu-post-install" target="_blank" rel="noopener" class="btn nav-cta" style="background:var(--bg3);color:var(--text);border:1px solid var(--border);display:flex;align-items:center;gap:.4rem">
+      <svg width="13" height="13" viewBox="0 0 24 24" fill="currentColor"><path d="M12 0C5.37 0 0 5.37 0 12c0 5.3 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61-.546-1.387-1.333-1.756-1.333-1.756-1.09-.745.083-.729.083-.729 1.205.084 1.84 1.237 1.84 1.237 1.07 1.834 2.807 1.304 3.492.997.108-.775.418-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.468-2.38 1.235-3.22-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.3 1.23a11.5 11.5 0 0 1 3.003-.404c1.02.005 2.047.138 3.003.404 2.29-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.91 1.235 3.22 0 4.61-2.807 5.625-5.479 5.92.43.372.823 1.102.823 2.222 0 1.606-.015 2.898-.015 3.293 0 .322.216.694.825.576C20.565 21.795 24 17.295 24 12c0-6.63-5.37-12-12-12z"/></svg>
+      GitHub
+    </a>
+    <a href="#quickstart" class="btn nav-cta">Get started →</a>
+  </div>
 </header>
 
 <!-- HERO -->
@@ -665,7 +671,7 @@ <h1>
   <div class="stat"><div class="stat-num">20</div><div class="stat-label">Optional extras</div></div>
   <div class="stat"><div class="stat-num">7</div><div class="stat-label">Extras groups</div></div>
   <div class="stat"><div class="stat-num">3</div><div class="stat-label">Firewall engines</div></div>
-  <div class="stat"><div class="stat-num">CIS</div><div class="stat-label">Benchmark aligned</div></div>
+  <div class="stat"><div class="stat-num">60+</div><div class="stat-label">CLI flags</div></div>
 </div>
 
 <!-- FEATURES -->
@@ -720,7 +726,7 @@ <h2 class="section-title">Up and running in one command.</h2>
   <div class="pre-wrap">
     <button class="copy-btn" onclick="copyCode(this)">copy</button>
 <pre><span style="color:var(--dim)"># Download</span>
-curl -O https://raw.githubusercontent.com/franckferman/ubuntu-post-install/main/ubuntu-post-install.sh
+curl -O https://raw.githubusercontent.com/franckferman/ubuntu-post-install/stable/ubuntu-post-install.sh
 
 <span style="color:var(--dim)"># Run with defaults — dark theme, performance, all 15 steps</span>
 bash ubuntu-post-install.sh
@@ -941,8 +947,13 @@ <h2 class="section-title">Every default documented.<br>Every choice overridable.
       <div class="opt-group-head">🐚 Zsh</div>
       <div class="opt-row"><div class="opt-flag">--p10k-preset</div><div class="opt-desc">Powerlevel10k prompt preset</div></div>
       <div class="opt-row"><div class="opt-flag">--p10k-segments</div><div class="opt-desc">Apply extended segment config</div></div>
+      <div class="opt-row"><div class="opt-flag">--no-p10k-custom</div><div class="opt-desc">Skip custom p10k segment overrides</div></div>
+    </div>
+
+    <div class="opt-group">
+      <div class="opt-group-head">⚙️ General</div>
       <div class="opt-row"><div class="opt-flag">--steps</div><div class="opt-desc">Run specific steps e.g. <code>1,3-7,15</code></div></div>
-      <div class="opt-row"><div class="opt-flag">--no-emojis</div><div class="opt-desc">Plain text output symbols</div></div>
+      <div class="opt-row"><div class="opt-flag">--no-emojis</div><div class="opt-desc">Plain text output (for CI / logging)</div></div>
     </div>
   </div>
 </div>
@@ -1044,7 +1055,7 @@ <h2>Ready to automate your setup?</h2>
 
 <!-- FOOTER -->
 <footer>
-  ubuntu-post-install v2.0.0 · <a href="https://github.com/franckferman" style="color:var(--dim)">Franck FERMAN</a> · 2026
+  ubuntu-post-install v2.0.0 · <a href="https://github.com/franckferman" style="color:var(--dim)">Franck FERMAN</a> · <a href="https://github.com/franckferman/ubuntu-post-install" style="color:var(--dim)">GitHub</a> · <a href="LICENSE" style="color:var(--dim)">AGPL-3.0</a> · 2026
 </footer>
 
 <script>