[#1] Adds base css and twig files

* Removes useless Symfony upgrade
  notes
[#1] Create skeleton layout with basic css

* Add basic twig layout in base.html.twig
* Add basic CSS layout in davidvernet_base.css
Merge branch 'task-1-make_general_layout' into develop
[#2] Compose body paragraph of home page

* Describes purpose of website at a
  holistic level.
* Directs user to different parts of
  website.
* Has NOT been tested!
[#1] Add link block and link to base css asset
Merge branch 'task-1-make_general_layout' into develop
Merge with task-1
Merge branch 'develop' into task-2-create_welcome_page

Conflicts:
	src/DCVDev/Bundle/PersonalSiteBundle/Resources/views/PersonalSite/index.html.twig
[#2] Update composer and finish welcome page
Merge branch 'task-2-create_welcome_page' into develop
[#3] Update README file

* README file previously contained
  auto-generated Symfony text.
  Replaced with text for the site.
[#3] Correct formatting errors of README

* Was not rendering correctly on github,
  has since been fixed.
Merge branch 'task-3-update_readme_file' into develop
Merge branch 'develop'