[DOCS] Adds context selector widget to the getting started page

[szabosteve]

Overview

This PR adds context selector widgets to the Getting started page. As the Go client utilizes two sets of APIs – low-level and fully-typed – it is useful to provide the possibility for the user to choose the context as it makes it easier to interpret the docs properly. The user's choice impacts all the widgets on the page; if they choose fully-typed in either of the widgets, the rest will also show the fully-typed tabs.

Preview

• Getting started

[Anaethelion]

That looks great, thank you!

[github-actions]

The backport to 8.11 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-8.11 8.11
# Navigate to the new working tree
cd .worktrees/backport-8.11
# Create a new branch
git switch --create backport-751-to-8.11
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 0fba0e4b6ce5fbba43eb438a18c79c9f2d663c63
# Push it to GitHub
git push --set-upstream origin backport-751-to-8.11
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.11

Then, create a pull request where the base branch is 8.11 and the compare/head branch is backport-751-to-8.11.