docs: add growing your project section

[CBID2]

Description

This PR adds a section to the Maintainers Guide on growing open source projects. It will give maintainers an idea on how OpenSauced can help them with this process.

What I have done so far

• [x] Add growing-your-project.md to docs > maintainers

• [x] In sidebar.js, add `maintainers/growing-your-project' path below the guide: "maintainers/maintainers-guide-to-open-sauced",

• [x] In growing-your-project.md, create the following sections:

  • [x] When to grow your project (brief explanation of need to get more contributors or add people to teams (maintainers, triage, docs)

  • [x] How to identify new contributors and team members

    • [x] Look at existing contributors. How is there participation? Are they engaged? Are they invested in the success of the project?
    • [x] Create an insight page with your projects. Add the most active contributors to a list.

  • [x] Recruiting team members and contributors

    • [x] Create an insight page with projects similar to yours. Add contributors you think might be a good fit to a list. After spending some time monitoring, reach out to them.

  • [x] Understanding Team Participation.

    • [x] It's important to monitor team participation. Once you have someone on a team, add them to your list to monitor your participation. (Use the team sync feature -- link to the gif). It's useful to set a timeframe for how active they need to be.

Related Tickets & Documents

Closes #235

Mobile & Desktop Screenshots/Recordings

Steps to QA

Tier (staff will fill in)

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

[optional] Are there any post-deployment tasks we need to perform?

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