Refresh docs/Gemfile.lock to reference local gem path

Replaces the GIT block (github.com/ruby-ui/ruby_ui revision pin)
with a PATH block pointing at ../gem, matching the new Gemfile entry.
Re-resolved with `bundle lock`; no other dependency versions move.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: cirdes

docs/Gemfile.lock

@@ -12,10 +12,8 @@ GIT
   specs:
     phlex (2.0.2)
 
-GIT
-  remote: https://github.com/ruby-ui/ruby_ui.git
-  revision: 856136f40bc4d5be942e39506e56fb08348afc93
-  branch: main
+PATH
+  remote: ../gem
   specs:
     ruby_ui (1.1.0)