Join the Odin Community: Add missing LO/KC sections and fix google bot command

[MaoShizhong]

Because

Originally just fixing the suggested bot command for google searches which is now /search google instead of /google (TheOdinProject/odin-bot-v2#513).

Lesson was also missing LO/KC sections which were simple enough to add in to appease the linter and follow the style guide's lesson structure.

This PR

• Updates command name for google search with Odinbot
• Adds lesson overview and knowledge check sections
• Fixes general linting errors

Issue

N/A

Additional Information

N/A

Pull Request Requirements

• I have thoroughly read and understand The Odin Project curriculum contributing guide
• The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• If any lesson files are included in this PR, they follow the Layout Style Guide