Update OCIO Website documentation Readme.md (#1300)
Update OCIO Website documentation Readme.md (#1300)

* Update OCIO Website documentation Readme.md

Adds commands in nice boxes with syntax highlighting, better Markdown formatting, and clearer steps for building the OCIO homepage.

Updates based on @carolalynn22 suggestions

Implements above suggestions!  Good ideas :)

Signed-off-by: Henry Wilkinson <3eca10f30041813f045165784e24b5a950a6cc7e@wilkinson.graphics>

* Fixes typo

Oops!

Signed-off-by: Henry Wilkinson <3eca10f30041813f045165784e24b5a950a6cc7e@wilkinson.graphics>

Co-authored-by: Michael Dolan <688080ba093bba32b8050b0536b1c7a964e2656e@gmail.com>
AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO