New Installation page

[GomezIvann]

Checklist

• The build process is done without errors. All tests pass in the /lib directory.
• Self-reviewed the code before submitting.
• Meets accessibility standards.
• Added/updated documentation to /website as needed.
• Added/updated tests as needed.

Description
We wanted to improve our documentation site as part of this release's Halstack enhancements. The first idea is to add Installation guidelines to help users install the halstack-react npm package.

Extra changes:

• Link padding removed to avoid extra spacing between words when there's a link in between.
• Adjusted responsive breakpoints in the website. Now the side nav disappears at a small laptop size and the quick nav at a table size.
• New CodeBlock component in the site.
• Example site component has been updated using Halstack color palette (it used to have its own colors).

Screenshots