Customize UI to differentiate from Chromium's instance

- Rename "Monorail" in the home page's header to "avm99963 bugs".
- Remove <chops-announcement>.
- Remove Chromium logo from the home page background.
- Add markdown support for the vulnz and vulnz-old projects.

GitOrigin-RevId: 57bcf549c1eb7c383d25e6a4790c90337d396e91
diff --git a/static_src/elements/framework/mr-header/mr-header.js b/static_src/elements/framework/mr-header/mr-header.js
index 6603c85..be6afad 100644
--- a/static_src/elements/framework/mr-header/mr-header.js
+++ b/static_src/elements/framework/mr-header/mr-header.js
@@ -198,7 +198,7 @@
       </a>
       ${this._headerTitle ?
           html`<span class="home-link">${this._headerTitle}</span>` :
-          html`<a href="/" class="home-link">Monorail</a>`}
+          html`<a href="/" class="home-link">avm99963 bugs</a>`}
 
       <div class="right-section">
         ${this._renderAccount()}