enhance code clarity

Mail is sent only when flood is detected, but not for following
submission failures.

fix toc and add arrow in header box

See merge request !222

Develop

See merge request !220

fix GITLAB_TOKEN and destination branch name for merge request

See merge request !219

Develop

See merge request !216

pass env-var GITLAB_TOKEN to apache

See merge request !215

Mentions légales + fix theme

See merge request !213

enhance code clarity

Develop

See merge request !214

fix GITLAB_TOKEN

See merge request !212

Develop

See merge request !211

get GITLAB_TOKEN from env

See merge request !210

Develop

See merge request !209

Dev loic

See merge request !208

Job offer filters in toc and add offer as special card

See merge request !207

Related to #143

Texte groupe + logo ANF

See merge request !205

logos partenaires

See merge request !204

# Conflicts:
#   content/evt_tech/2019-09-anf-perf-eval-hpc.rst
#   content/pages/presentation_groupe.rst
#   plugins/rst_include/include.rst

Also fixing some figures and images style.

Fix #141

So that the details are printed in the webserver log and a specific page is
displayed to the client (without the details).

Script pour rendre les issues actuelles confidentielles

See merge request !192