Integrate nc-landing

NC-182
Move visuals to the nodeconductor.core application

NC-182
Modify base_settings and gitignore

NC-182
Remove unnecessary static_dir, modify template

NC-182
Fix bug in the template

NC-182
Clean up landing html
Merge branch 'feature/nc-182' into 'develop'

Feature/nc-182(integrate core landing with codebase)
main page url fixed