[Shiny] Sling Website Design

As part of SLING-6666, it was mentioned the Sling website needs a re-design to help attract new developers and make the site easier to use on mobile devices.

Now that the site is on JBake, it probably makes sense to start working on this.

The attached mockup is an initial take on the homepage. It's not meant to be all-encompassing, but should provide a view into what the site could look like and how it could match the new Sling Launchpad design.

Notes

• The image is pulled from Adobe Stock. Hopefully this can be donated, or we can pull from the community to get an image we want to use. Was thinking "greenfield" and not overly distracting.
• I was looking for something punchy for the title text. "Effortlessly build resource-driven web-applications." is what I came up with.
• About text has been un-touched.
• Easy build instructions are right on the homepage. Docker first, with Java just a tab click away. This follows Docker now being the priority on the getting started page.
• News, Get Involved, and Additional Resource should be mostly self-explanatory.
• The navigation is designed around the common areas of the current left hand rail, but with tutorials being broken out. This is a result of the many devs I've on-boarded that prefer walk-throughs over raw docs.

Overall the idea is to give a single page of the main topics, but kick out to the pages already established.

Let me know your thoughts.