Documentation Updated: Installation, landing page and resources

[jjfumero]

Description

This PR updates the documentation with special attention to the installation steps for all supported OS.

Problem description

n/ a.

Backend/s tested

Mark the backends affected by this PR.

• [ ] OpenCL
• [ ] PTX
• [ ] SPIRV

OS tested

Mark the OS where this PR is tested.

• [ ] Linux
• [ ] OSx
• [ ] Windows

Did you check on FPGAs?

If it is applicable, check your changes on FPGAs.

• [ ] Yes
• [X] No

How to test the new patch?

make docs
google-chrome docs/build/html/index.html