Move Arch instructions to the end, together with generic Linux distros paragraph.
Fix Windows section formatting.
Merge pull request #995 from ramiro/handbook-fixes

Misc. handbook fixes.
Update certain documents (add lead styling)

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
make new_post error a bit more intelligent

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
trailing slash

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
update `nikola help` output in the manual

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
rewrite a nonsense sentence in the manual re new_post (via @gour)

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>