feat: add missing project files and fix architecture compliance

- Add LICENSE file (MIT)
- Add CONTRIBUTING.md with generator-first workflow guidelines
- Add Makefile with comprehensive development commands
- Add .editorconfig for consistent code formatting
- Add CHANGELOG.md for version tracking
- Remove inconsistent non-variant files that bypassed generator architecture
- Fix installation script to use variant-specific paths (prevent config overwriting)

cli/glances/glances-light-medium.conf

@@ -0,0 +1,42 @@
+# Everforest theme for Glances
+# Generated from template - do not edit manually
+
+[colors]
+# Default colors
+default=#5c6a72
+default_selected=#5c6a72
+
+# Status colors
+OK=#a7c080
+CAREFUL=#dbbc7f
+WARNING=#e69875
+CRITICAL=#e67e80
+
+# Interface colors
+title=#7fbbb3
+help=#83c092
+status=#5c6a72
+
+# Process colors
+process=#5c6a72
+process_high=#e67e80
+
+# Filesystem colors
+filesystem_used=#e69875
+filesystem_free=#a7c080
+
+# Network colors
+network_rx=#a7c080
+network_tx=#7fbbb3
+
+# CPU colors
+cpu_user=#7fbbb3
+cpu_system=#e67e80
+cpu_idle=#b3c0b0
+cpu_iowait=#d699b6
+
+# Memory colors
+memory_used=#e69875
+memory_free=#a7c080
+memory_cached=#83c092
+memory_buffer=#dbbc7f