New Page for Getting Started with SLIM

[riverma]

Purpose

• A simpler way to view aggregate SLIM recommendations in one place through a checklist a team member can review
• Guidance on using the SLIM Starter Kit
• FEEDBACK WELCOME: https://github.com/NASA-AMMOS/slim/blob/issue-115/docs/guides/checklist.md

Proposed Changes

• [ADD] New Getting Started page with checklist and guidance on SLIM starter kit usage
• [CHANGE] Fixes to broken links
• [CHANGE] Fixes to UI elements for better readability

Issues

• [New Best Practice Guide]: Getting Started Guide for a Project #115

Testing

• Tested successful rendering on local Docusaurus

[riverma]

Sorry for the short time to review folks! Need this for a demo tomorrow ;). Please post a new PR or issue ticket if you have concerns with this PR.