Update landing page styles

[louisphn]

Closes #26

• Updated landing page styles according to proposed design
  Preview:
  

Scopes:

• Changed files: AppHeader.tsx, pages/index.tsx, pages/_app.tsx
• New files: lib/data.ts, styles/header.module.css, styles/landing.module.css

PS: Responsive layout has not been featured yet, if it is necessary please let me know

[vercel]

Someone is attempting to deploy a commit to the ACM UTD Team on Vercel.

A member of the Team first needs to authorize it.

[abdullah50053]

Could you use TailwindCSS instead of vanilla CSS?
Aside from that, everything looks great.

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/acmutd/hackportal/7xpsH27i3jv3iYtkZiE4StaU2Per
✅ Preview: https://hackportal-git-fork-louisphn-feat-landing-page-styling-acmutd.vercel.app

[louisphn]

I have changed all vanilla css styling to Tailwindcss and here is a preview of landing page:

Please take a look when you have time and let me know if there is anything needed to be changed

[abdullah50053]

Looks good! Thanks for your contributions to open source, and I recommend you take a look at issues #27 #28 #29 and #30 if you'd like to continue work on the landing page :)