Added LATEST tag to documentation

1)TC0,TC1,TC2 tags are unmodified and a new tag is added to point to
current documentation changes present in docs branch
2)Since TC0 src files are not ported changed the references to it in tc2 index
3)added docker related information and kself test info

Signed-off-by: Annam Sai Manisha <annam.saimanisha@arm.com>