DOP-5259: interactive method selector for offline docs

[seungpark]

Stories/Links:

DOP-5259

Staging Links:

S3 file to download and verify that method selector works offline

online docs without OFFLINE_DOCS env flag for regression check

Notes:

• The arrow indicator has been removed for offline method selectors as it needs some calculations based on selected index to get the position
• On this Page headings will be handled separately as the content values are hidden in a React context

README updates

• • This PR introduces changes that should be reflected in the README, and I have made those updates.
• • This PR does not introduce changes that should be reflected in the README

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