Add support for User Feedback

[bmorelli25]

Summary

We need to make it easy for users to:

• Make a contribution to the docs
• Tell us when they like/dislike our docs

We can do this by providing a place, directly in the docs, that links users to relevant documentation source files, and gives users the ability to send feedback directly to a technical writer.

Examples:

GitHub API docs

Buildkite docs

V1/V2 Feedback

We have a feedback widget in V1/V2 that works like this:

1. User submits feedback
2. docs.elastic.co API request (validation of data)
3. Remote function API request
4. Data added to Big Query
5. Data manually added to ES

Downsides:

• Manual
• Users can't add context to their feedback (can only select yes/no)
• No way for us to notify users that their feedback was implemented