why nix is covered in intro

Dependencies

• [2] 6A6CZ7SC draft manual
• [3] QPXJVRYK boilerplate, platform stuff

Change contents

• edit in doc/manual/manual.html at line 276
  [2.2977]→[2.2977:2996](∅→∅)
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  − <p/>

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  − Why Nix ...