refactor: modernize http cache interceptor and improve documentation}
* Update README.md with improved formatting and clearer examples * Upgrade package versions in root and library package.json files * Simplify http-cache-config token implementation * Refactor http-cache-interceptor to reduce complexity and improve readability * Modernize http-cache-interceptor module with updated Angular patterns * Update public API exports for better clarity * Enhance app component template * Simplify global styles by removing redundant CSS rules and improving maintainability