This PR changes `<Link>` to use `prefetch={false}` in the following
components:
1. Header
2. Sidebar
3. Docs header
4. Markdown content
This means that prefetch happens on hover of the link rather than page
load, and will reduce the amount of edge requests made from the app.
## Current Behavior
<!-- This is the behavior we have today -->
## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
-->
## Related Issue(s)
<!-- Please link the issue being fixed so it gets closed when this is
merged. -->
Fixes #
Adjusted the Contact Us wording and changed the primary contact link on the website from sales to engineering. The sales link is also presented with a more engaging prompt.
Corrected a typo error in the 'Contact engineers' link from `/contact/enigeering` to `/contact/engineering`. Also, unused 'Contact us' section was removed from the file.
