Scrape from classes plan only, dark mode

What's Changed

• fix the issue by @kubagp1 in #29
• add support for codespaces by @kubagp1 in #33
• Hide columns tweaks by @kubagp1 in #34
• restructure docker files, add a try catch to scraping by @kubagp1 in #36
• add scraping from classes only by @kubagp1 in #37
• Scrape from classes by @kubagp1 in #45
• fix hide-columns by @kubagp1 in #46
• add dark mode by @kubagp1 in #47
• improve frontend code and move grade handling to frontend by @kubagp1 in #48
• Fix-weekday-selector-overlapping by @kubagp1 in #51

Full Changelog: v0.6...v0.7