doc: linkify some references

Signed-off-by: Ran Benita <ran234@gmail.com>
doc: disable tree view

It is redundant with the header navigation.

Signed-off-by: Ran Benita <ran234@gmail.com>
doc: disable BRIEF_MEMBER_DESC

It's easier to quickly go through the functions in a module this way.
The names provide enough "brief description" to get someone to click for
the full description.

Signed-off-by: Ran Benita <ran234@gmail.com>
doc: disable alphabetical data structure index

It is useless - we have very little data structures.

Signed-off-by: Ran Benita <ran234@gmail.com>