Added mention of new apis in declare permissions doc

Signed-off-by: Shwetank Dixit <emailshwetank@gmail.com>
added 'requirements' in manifest doc

Signed-off-by: Shwetank Dixit <emailshwetank@gmail.com>
Changes in the description table.

Signed-off-by: Shwetank Dixit <emailshwetank@gmail.com>
Changes in the sidebar to reflect new articles and docs

Signed-off-by: Shwetank Dixit <emailshwetank@gmail.com>