Reordered the documentation to keep all `testenv` usage and arguments together.
Moved the `install --testenv` section below to maintain a logical flow:
- First set up the test environment
- Then install Bifrost services into it
This improves clarity and aligns with reviewer feedback.
Change-Id: I64dddbaba37f3f92b999845575223f8df7b9b945
Signed-off-by: Queensly Kyerewaa Acheampongmaa <qacheampong@gmail.com>
86366ec454