Update developer_manual/routing.rst

proofreading while reading :)
restructured dev docs and merged redundant files
moved templates file
fixed small spelling mistakes
small fixes
small fixes
small fixes
small fixes
moved translation into core2
ordered left menu
improved data migration
small datamigration fixes
added notice about running unittests in multiple app directories
moved notice to unittests section
removed wrong info
Update admin_manual/configuration_mail.rst

added description of SMTP authentication type (mail_smtpauthtype).
added links for documentation and translation
added pimple link to apps developement page
added general section on the main page
added appframework api files