Landing page open-enrollment redesign

[NickK21]

Summary

• updates the logged-out landing page to match the new Figma layout
• adds the teacher account CTA linking to the Google Form in a new tab
• adds the Join open-enrollment courses section to both logged-out and logged-in home views
• shows all open-enrollment courses with course title, language, and ordered module names
• adds language filtering and title/newest sorting for open-enrollment courses
• preserves join intent through login and sends users into the student course view after joining
• allows the landing-page data route to be accessed without authentication

Closes #157

[DAC098]

nit picks and questions

[DAC098]

what was the reasoning behind adding these back in. did you run into issues when working on this.

[DAC098]

this could be a ternary

[DAC098]

you can use PropsWithChildren to help with this

import {PropsWithChildren} from "react";

function HomeSection({title, children}: PropsWithChildren<{title: string}>) {
    return <div title={title}>{children}</div>;
}