Add Install Gateway section in Getting Started Latest guide

[dharaneeshvrd]

• Move instructions from the Deploy an Inference Gateway section describing installation of Gateway API CRDs and provider specific GWs

What type of PR is this?

What this PR does / why we need it:
#1752

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

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[nirrozenbaum]

@dharaneeshvrd can you please rebase?
there were a few changes to the quickstart

[dharaneeshvrd]

@nirrozenbaum Done, can you please take a look?

[nirrozenbaum]

@dharaneeshvrd really apologize, had unexpected urgent tasks and I didn't get to review it last week and now rebase is needed again.. can you please rebase? 🙏
sorry for the inconvenience.

[dharaneeshvrd]

@nirrozenbaum
Sure np, rebased again, ptal!