Add of fontawesome

Glyphicon has been deprecated in the Bootstrap 4. The natural
replacement is fontawesome that I added in the template system and
updated some of the main links.
Signed-off-by: Matthieu Berjon <matthieu.berjon@inria.fr>

django/static/fonts/fontawesome/LICENSE.txt

+Font Awesome Free License
+-------------------------
+
+Font Awesome Free is free, open source, and GPL friendly. You can use it for
+commercial projects, open source projects, or really almost whatever you want.
+Full Font Awesome Free license: https://fontawesome.com/license.
+
+# Icons: CC BY 4.0 License (https://creativecommons.org/licenses/by/4.0/)
+In the Font Awesome Free download, the CC BY 4.0 license applies to all icons
+packaged as SVG and JS file types.
+
+# Fonts: SIL OFL 1.1 License (https://scripts.sil.org/OFL)
+In the Font Awesome Free download, the SIL OLF license applies to all icons
+packaged as web and desktop font files.
+
+# Code: MIT License (https://opensource.org/licenses/MIT)
+In the Font Awesome Free download, the MIT license applies to all non-font and
+non-icon files.
+
+# Attribution
+Attribution is required by MIT, SIL OLF, and CC BY licenses. Downloaded Font
+Awesome Free files already contain embedded comments with sufficient
+attribution, so you shouldn't need to do anything additional when using these
+files normally.
+
+We've kept attribution comments terse, so we ask that you do not actively work
+to remove them from files, especially code. They're a great way for folks to 
+learn about Font Awesome.
+
+# Brand Icons
+All brand icons are trademarks of their respective owners. The use of these
+trademarks does not indicate endorsement of the trademark holder by Font
+Awesome, nor vice versa. **Please do not use brand logos for any purpose except
+to represent the company, product, or service to which they refer.**

django/static/fonts/fontawesome/README.md

+# Font Awesome 5.0.8
+
+Thanks for downloading Font Awesome! We're so excited you're here.
+
+Our documentation is available online. Just head here:
+
+https://fontawesome.com

django/static/fonts/fontawesome/advanced-options/metadata/shims.yml

+area-chart:
+  name: chart-area
+arrow-circle-o-down:
+  name: arrow-alt-circle-down
+  prefix: far
+arrow-circle-o-left:
+  name: arrow-alt-circle-left
+  prefix: far
+arrow-circle-o-right:
+  name: arrow-alt-circle-right
+  prefix: far
+arrow-circle-o-up:
+  name: arrow-alt-circle-up
+  prefix: far
+arrows:
+  name: arrows-alt
+arrows-alt:
+  name: expand-arrows-alt
+arrows-h:
+  name: arrows-alt-h
+arrows-v:
+  name: arrows-alt-v
+bar-chart:
+  name: chart-bar
+  prefix: far
+bitbucket-square:
+  name: bitbucket
+  prefix: fab
+calendar:
+  name: calendar-alt
+calendar-o:
+  name: calendar
+  prefix: far
+caret-square-o-down:
+  name: caret-square-down
+  prefix: far
+caret-square-o-left:
+  name: caret-square-left
+  prefix: far
+caret-square-o-right:
+  name: caret-square-right
+  prefix: far
+caret-square-o-up:
+  name: caret-square-up
+  prefix: far
+cc:
+  name: closed-captioning
+  prefix: far
+chain-broken:
+  name: unlink
+circle-o-notch:
+  name: circle-notch
+circle-thin:
+  name: circle
+  prefix: far
+clipboard:
+  prefix: far
+clone:
+  prefix: far
+cloud-download:
+  name: cloud-download-alt
+cloud-upload:
+  name: cloud-upload-alt
+code-fork:
+  name: code-branch
+commenting:
+  name: comment-alt
+compass:
+  prefix: far
+copyright:
+  prefix: far
+creative-commons:
+  prefix: fab
+credit-card:
+  prefix: far
+credit-card-alt:
+  name: credit-card
+cutlery:
+  name: utensils
+diamond:
+  name: gem
+  prefix: far
+eercast:
+  name: sellcast
+  prefix: fab
+eur:
+  name: euro-sign
+exchange:
+  name: exchange-alt
+external-link:
+  name: external-link-alt
+external-link-square:
+  name: external-link-square-alt
+eye-dropper:
+  name: eye-dropper
+  prefix: far
+eye-slash:
+  prefix: far
+eyedropper:
+  name: eye-dropper
+facebook:
+  name: facebook-f
+  prefix: fab
+facebook-official:
+  name: facebook
+  prefix: fab
+file-text:
+  name: file-alt
+files-o: