Version 2.0 released

• New Schedule page with more efficient use of space.
• Gregorian calendar is now the default one (English Calendar).
• Add customization options to home, assignments, lectures, and schedule pages.
• Add support for themes (so you can modify the website's look according to your school's brandings)!.
• Move navigation menus to YAML which means it is now easier to add new pages.
• Add more flexibility to lecture's links