docs(react-sdk,browser-sdk): updated various out-of-date docs

[roncohen]

• Simplified the getting started instructions
• Cleaned up outdates "features update" instructions. There's "Event listeners" instead.
• Update docs to reflect that featureOptions are passed at the root level now

[Swiftwork]

AI Review

Here are a few observations regarding the wording and spelling in the provided diff:

Browser SDK README

1. Line 108: "Increase in the case of a non-SPA" - The statement is incomplete and needs more context to specify what should be increased.
2. Line 248: "user" should be enclosed in backticks (`user`) for consistency with "company".

React SDK README

1. Line 74: "track" function call is missing a reference to the function itself, only isEnabled is deconstructed.
2. Line 88: "Attributes cannot be nested (multiple levels) and must be either strings, integers or booleans." - Consider changing "integers" to "numbers" for consistency.
3. Line 142: "fetch features and start listening for automated feedback survey events. The component can be configured using a number of props:" - This sentence can be simplified for clarity.
4. Line 143: "publishableKey" should be enclosed in backticks (`publishableKey`) for consistency with other mentions.
5. Line 190: "enableTracking Set to" - There should be a colon (:) after "enableTracking".
6. Line 234: "How do you like Huddles?" - Consider changing to "How do you like the Huddles feature?" for clarity.

These are minor issues but addressing them can help improve the readability and consistency of your documentation.

[roncohen]

useful! It doesn't really do well with backticks. Two cases it wanted to update already had them:

Rest was really good.