Issue 336- change landing page colors, add styling to github link

[Illuztrado]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change. Additionally, please include reasoning if tests have failed.

Type of change

Please select everything applicable. Please, do not delete any lines.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update
• [x] This change requires an update to testing

Issue

• [x] Is this related to a specific issue? If so, please specify:

  336

Summary of changes:

• Change color customization in tailwind
• Change color scheme of some elements in the landing page
• Add styling to github link in the landing page

Additional comments:

• tests failed on my local machine (Windows 10) after executing npm run test-frontend but app functionality seems to work fine; changes seem to have passed the tests when @Caleb-Cohen tried to execute them on their local machine
• getting an "[eslint] Delete CR [prettier/prettier]" error on my local machine when executing npm run dev-concurrent and npm run lint. This seems to fix the issue on my local machine: https://stackoverflow.com/questions/53516594/why-do-i-keep-getting-eslint-delete-cr-prettier-prettier

Checklist:

• [x] This PR is up to date with the main branch, and merge conflicts have been resolved
• [ ] I have executed npm run test and all tests have passed successfully or I have included details within my PR on the failure.
• [x] I have executed npm run lint and resolved any outstanding errors. Most issues can be solved by executing npm run format
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] My changes generate no new warnings

[Caleb-Cohen]

Thanks for the write up on tests. The fix is being worked on, but this PR passed on mac and linux.

@Natashka333 can you review the PR to make sure the changes meet specifications?

[Natashka333]

@Illuztrado , everything looks great! I was a little unsure about the blue color for the sections (since those were in white in Figma), but now that I see it, I think it looks super cool! Thanks for going with your gut on that one. Great Job! Thank you for your contribution!