Updating the documentation

[cmaumet]

This Pull Request is related to issue [#](add a link to the issue here).

Changes proposed in this Pull Request:

• Shorten the README
• Add two trails in the CONYRIBUTING document (nipype expert versus fMRI software expert)

Checklist:

• Descriptive title
• Targets the main branch
• Changes are functional
• [NA] My code is explicit and comments were added to it
• [NA] Code conforms with PEP8
• [NA] Tests were added for the changes and they complete successfully
• [NA] Existing tests were updated (if needed) and they complete successfully
• Documentation was updated

To be done:

• fmri software trail is currently empty
• we need a quick example of how to use the team description module

[bclenet]

Maybe we should not create this file for now, until we have a place for the dev documentation ?

[cmaumet]

Happy to do as you think is best. Can you remind me where the dev documentation is located so that I can move these?

[cmaumet]

@bclenet Thanks for the review! I've updated following your comments. If you can check my reply to the comments above and let me know if all is good before we merge?