Some minor stylistic improvements on docs generation

- [x] Show links to prelude, builtins and stdlib
  - [x] Remove project 'owner' in the header (only show repository)
  - [x] Fix type annotation overflow on mobile
  - [x] Remove the prewrap mode on mobile

crates/aiken-project/templates/_layout.html

@@ -166,6 +166,11 @@
         <svg class="label icon icon-x-circle" alt="Open Search" title="Open Search"><use xlink:href="#icon-svg-search"></use></svg>
       </button>
 
+      <nav>
+        <a href="https://aiken-lang.github.io/prelude/aiken.html">Prelude</a>
+        <a href="https://aiken-lang.github.io/prelude/aiken/builtin.html">Built-ins</a>
+        <a href="https://aiken-lang.github.io/stdlib">Stdlib</a>
+      </nav>
     </header>
 
     <div class="page">