Website cleanup

Website clean-up and bug fixes:

• Reformat tags indentations in source code.

• Add <thead> tags in table:

• Update teams members roles.

• Fix BiRD missing GPU name.

• Fix footer issues (non-closed tags).

• Add README to project homepage

• Minor typos

• Fix large screen tiles width (back to 3xN tiles, not 2xN):

before:

after: