css: Adjust style of headers h1, h2 and h3
css: Adjust style of headers h1, h2 and h3

Signed-off-by: Jordan Justen <ab3d56373f2461770fa8feb620844a5acfe35e29@gmail.com>

Teino1978-Corp/Teino1978-Corp-tianocore.github.io,jljusten/tianocore,Teino1978-Corp/Teino1978-Corp-tianocore.dashboard,jljusten/tianocore,tianocore/tianocore.github.io,Teino1978-Corp/Teino1978-Corp-tianocore.dashboard,tianocore/tianocore.github.io,Teino1978-Corp/Teino1978-Corp-tianocore.github.io