Update lab sheets and enhance highlighting functionality

- Modified permalink structure in the configuration to include category in lab URLs.
- Added author and license metadata to lab sheets for better attribution and clarity.
- Introduced a comprehensive highlighting guide for AI assistants to standardize lab sheet formatting.
- Enhanced JavaScript functionality to support multiple highlight types and improved table of contents generation.
- Updated styles for various highlight types to improve visual distinction in lab content.
- Added a new logo for branding consistency across the site.

_plugins/highlight_extension.rb

@@ -1,12 +0,0 @@
-# Jekyll plugin to support ==highlight== syntax
-module Jekyll
-  module HighlightFilter
-    def highlight_text(input)
-      return input if input.nil?
-      # Convert ==text== to <mark>text</mark>
-      input.gsub(/==([^=]+)==/, '<mark>\1</mark>')
-    end
-  end
-end
-
-Liquid::Template.register_filter(Jekyll::HighlightFilter)