docs: add a guide for maintainers on how to growing their open source projects

[CBID2]

Description

This PR adds a new guide in the maintainers section of OpenSauced's documentation site. It'll give them ideas on how to use OpenSauced's various features to grow their open source project.

Related Tickets & Documents

Closes #235 Relates to #291

Mobile & Desktop Screenshots/Recordings

Steps to QA

Tier (staff will fill in)

• [ ] Tier 1
• [ ] Tier 2
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[CBID2]

Hi @BekahHW. I just reread my entry for this PR, and I'm ready for a review.

[Constantine234]

how can i contribute to this?

[CBID2]

Hey @adiati98 and @BekahHW. My PR is ready for another review.

[CBID2]

Hey @BekahHW! :) Can you review this please?