changes to img size etc.
improve sass workflow and styling
Merge branch 'final-changes' of https://github.com/wzaghal/hackntalk into final-changes

pull final-changes
Merge branch 'final-changes' of https://github.com/wzaghal/hackntalk into content-changes

merge changes
hover effects
styling changes
Merge branch 'final-changes' of https://github.com/wzaghal/hackntalk into final-changes

pull changes
Merge branch 'final-changes' into content-changes

merging changes
minor styling changes