Create & use homegrown grid

[bstein]

Included in this PR:

• New Grid component (see details below)
• Adds two stories for the new Grid component ("Default" and "Nested")
• Updates all references to use new Grid component instead of from Material UI
• Removes Material UI dependency

New Grid component details:

• Based on Material UI & Bootstrap implementations and uses flexbox
• Single tag for both grid containers and grid items; consumer sets consumer and item booleans
• Supports nesting
• Supports flex-direction, justify-content, and align-items options
• Container Grid supports wrap options
• Container Grid supports rowSpacing, columnSpacing, or spacing (for both); input can be a number or an object for spacing based on breakpoints
• Item Grid supports relative (to 12-column grid) sizing based on breakpoints (e.g., xs={12} md={6})

This PR closes #53

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Name	Status	Preview	Updated
dept-engineering-blog-ui	✅ Ready (Inspect)	Visit Preview	Jul 14, 2022 at 7:18PM (UTC)