feat: introduction section

[juliexiong]

• Renamed "Getting Started" to "Introduction" and added a lot more content in that section
• Created side nav for "Introduction" to separate out content
• Added default and global <table> styling
• Fixed layout for Colors page
• Updated table design for Empty States

Closes #85

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Alex Recommends Report

Alex recommends the following language changes, but Alex is a regular expression based algorithm, so take them with a grain of salt.

src/_areas/application-framework/developers/installation.md

Level	Location	Word	Recommendation
:warning:	7:146	just	just may be insensitive, try not to use it
:warning:	40:515	host	host may be insensitive, use presenter, entertainer, emcee instead

src/_areas/design-system/developers/installation.md

Level	Location	Word	Recommendation
:warning:	9:16	chug	Don’t use chug, it’s profane

src/_areas/design-system/patterns/empty-states.md

Level	Location	Word	Recommendation
:warning:	37:67	hero	hero may be insensitive, use role-model, mentor instead
:warning:	51:215	hero	hero may be insensitive, use role-model, mentor instead

src/_areas/design-system/visuals/colors.md

Level	Location	Word	Recommendation
:warning:	1551:151	pop	pop may be insensitive, use parent instead