bootstrap/css: Added code to center portfolio subnav
includes/header (en): Fixed link to home and changed the color of the language link
portfolio/category (en): Added portfolio categories
portfolio/index (en): Added categories to the portfolio
includes/portfolio-subnav (en): Separated the portfolio subnav in an external file
portfolio (en): Separated the portfolio subnav in an external file
portfolio/index (en): Refactored code
images: Added images for the refactored code
portfolio/index (en): Changed location of a comment
portfolio/development (en): Added structure to automatize showing projects
portfolio/he (en): Added code to automatize showing projects
portfolio/id (en): Added code to automatize showing projects
portfolio/photography (en): Added code to automatize showing projects
portfolio/ur (en): Added code to automatize showing projects
portfolio/index (en): Simplified the code
portfolio/development (en): Simplified the code
portfolio/he (en): Simplified the code
portfolio/id (en): Simplified the code
portfolio/photography (en): Simplified the code
portfolio/ur (en): Simplified the code