Remove journey boxes from docs' landing page

[Savio-Sou]

Problem

https://noir-lang.org/ current lands on the index.jsx page with boxes for readers to self-categorize their interests and backgrounds:

@noir-lang/developerrelations brought up the self-categorization could hurt DocEx instead of improving it though, leaving readers confused and frustrated as their understanding of the categories might not necessarily match how doc authors comprehend them.

Happy Case

Remove the self-categorization boxes from index.jsx.

Project Impact

Nice-to-have

Impact Context

Improve docs reading experience.

Workaround

Yes

Workaround Description

Promote https://noir-lang.org/docs/ instead of https://noir-lang.org/.

Additional Context

The index.jsx page was introduced in #4081.

Would you like to submit a PR for this Issue?

None

Support Needs

No response

[Savio-Sou]

Discussed further with @noir-lang/developerrelations: instead of removing the landing page, we should remove the boxes for this Issue (and update content on the landing page where necessary with further PRs).

Issue updated accordingly.