everyday: fsck and gc are not everyday operations

everyday: fsck and gc are not everyday operations

Back in 2005 when this document was written, it may have made sense to
introduce ‘git fsck’ (then ‘git fsck-objects’) as the very first example
command for new users of Git 0.99.9.  Now that Git has been stable for
years and does not actually tend to eat your data, it makes significantly
less sense.  In fact, it sends an entirely wrong message.

‘git gc’ is also unnecessary for the purposes of this document, especially
with gc.auto enabled by default.

The only other commands in the “Basic Repository” section were ‘git init’
and ‘git clone’.  ‘clone’ is already listed in the “Participant” section,
so move ‘init’ to the “Standalone” section and get rid of “Basic
Repository” entirely.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>