v0.1.4 - split sidebar for mobile read-order

Changed

• Split sidebar into two partials so mobile readers see articles
  before taxonomy. Primary widgets (about, toc) render in
  <aside class="sidebar"> above <main>; secondary widgets render
  in <aside class="sidebar-bot"> below it. On desktop, a
  grid-template-areas layout pins both asides to the left column,
  preserving the previous visual.
• Widgets opt into the secondary block with position = "bot" in
  site config. Anything without a position stays primary, so the
  change is source-compatible for existing sites.

Added

• layouts/_partials/sidebar-bot.html. Only emits an <aside> when
  the current scope has at least one bot widget.