feat: set up for docs to be a subdirectory

[BekahHW]

Description

We're working on improving the SEO of our site. A quick win is to have our docs become a subdirectory instead of a subdomain. This sets it up.

Related Tickets & Documents

closes #300

Mobile & Desktop Screenshots/Recordings

Works using deploy preview for docs PR:

https://github.com/open-sauced/landing-page/assets/34313413/e49c8e6a-ca57-4d5f-b899-da48cf642fe9

Steps to QA

1. Run this project locally

2. Change the destination in the next.config.js to this:

   { source: '/docs/:path', destination: 'https://deploy-preview-309--docs-open.netlify.app/:path', }, { source: '/docs/', destination: 'https://deploy-preview-309--docs-open.netlify.app/', }

3. go to http://localhost:3000/docs.

Tier (staff will fill in)

• [ ] Tier 1
• [ ] Tier 2
• [x] Tier 3
• [ ] Tier 4

[optional] What gif best describes this PR or how it makes you feel?

[netlify[bot]]

✅ Deploy Preview for opensauced-landing ready!

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📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 100 (no change from production) Accessibility: 91 (no change from production) Best Practices: 92 (no change from production) SEO: 83 (no change from production) PWA: - View the detailed breakdown and full score reports

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