Add CTA buttons/links

[kprosise]

Link added to home page to FoundriesFactory product page. Logo now linkes to Foundries homepage.
Button added to home page to book a demo.

QA Steps: checked links, and that the output renders as intended.

This commit addresses MKT-799, "Add Foundries.io liinks to Docs pages"

PR Template and Checklist

Please complete as much as possible to speed up the reviewing process.

Readiness and adding reviewers as appropriate is required.

All PRs should be reviewed by a technical writer/documentation team and a peer.
If effecting customers—which is a majority of content changes—a member of Customer Success must also review.

Readiness

• Merge (pending reviews)
• Merge after date or event
• Draft

Overview

Adds requested links

Checklist

• Run spelling and grammar check, preferably with linter.
• Avoid changing any header associated with a link/reference.
• Run make linkcheck.
• View HTML in a browser to check rendering.
• follow best practices for commits.
  • Descriptive title written in the imperative.
  • Include brief overview of QA steps taken.
  • Mention any related issues numbers.
  • End message with sign off/DCO line (-s, --signoff).
  • Sign commit with your gpg key (-S, --gpg-sign).
  • Squash commits if needed.
• Request PR review by a technical writer and at least one peer.

[doanac]

Docs for 040f30d are browsable at: https://ci.foundries.io/projects/fio-docs/builds/2770/docs/artifacts/html/index.html

[angolini]

beautiful