[3.8] Add bin/setup doc, remove old commands

This is related to alchemy-fr/Phraseanet#333
Add doc about bin/setup check:system exit codes
Add search with field example

Adress PR comment's

Typo

Typo

Typo
Fix #47 Add note about download url

Typo

Add french version
Address @anthonycabot comments
adressed @anthonycabot's comments
Fix #30 : Add archive task configuration example
Merge pull request #49 from romainneutron/configuration-tester

[3.8] Add bin/setup doc, remove old commands
[3.8] Add search engine documentation
[3.8] Add search engine documentation
Add SearchEngine page
Fix semantique
Address @anthonycabot comments
Update Nginx configuration
Fix #34 : Add note about migrations
Merge pull request #40 from romainneutron/search-engine

[3.8] Search engine
Merge pull request #57 from romainneutron/3.8-vhosts

[3.8] Update Nginx configuration
Merge pull request #68 from romainneutron/upgrade-notes

[3.8] Fix #34 : Add note about migrations
Merge pull request #65 from romainneutron/fix_30

[3.8] Fix #30 : Add archive task configuration example
Merge pull request #58 from nlegoff/download_url

[3.8] Fix #47 Add note about download url