Improve doc on the README (#1713)
Improve doc on the README (#1713)

* README: starting to address issue #1529

* fixed header

* added link to youtuube video

* updated anchors to headers

* added python 2.7 badge

* fixed display issue with badge

* removed python badge

* added logo

* Update README.md

* added GitHub release badge

* Update README.md

* test badge

* Update README.md

* Update README.md

* updated intro

* added graph of contributors

* Update README.md

* added link

* fixed link

* moved installation doc from sourceforge to here

* fixed formatting on installation

* added link to contribution guidelines

* switched order of links for clarity

* moved CHANGES link to installation-release

* fixed display issue

* added section Getting started

* Added feleyes integration video tutorial

* Added section on SCT courses

* fixed extra rendering []

https://github.com/neuropoly/spinalcordtoolbox/pull/1713#discussion_r187044287

* Reordered references

* Fixed spacing

* Fixed a few typos and installation clarification

Former-commit-id: d1cbb926eab8bd7007e0f2040cd28655e530446f
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox