Update site front-end #trivial

[michaelkolber]

• Style the site to make it look nicer
• Add images for both the landing page and the successfully submitted page
• Change the language to make it more user-friendly
• Make the site responsive/mobile-friendly

[CUNY-Bot]

	2 Warnings
:warning:	Big PR
:warning:	216 PEP 8 issues found

	2 Messages
:book:	Thanks for remembering to declare trivial!
:book:	All Unit Test Passed! 🤟

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