Update index.html

Add list in topics of #help-dialog
Update index.html

Add paragraph class in #help-dialog
Update core/sections.less

Add .paragraph styles
Update core/sections.less

Add .btn styles of #help-dialog
Update core/sections.less

Adjust btns of social section
Update core/social.less

Adjust btns of social section
Update ios/smartphones.less

Adjust sizes of btns in social section
Update index.html

Add number steps in social section
Update core/sections.less

Add creditos section styles
Update index.html

Adjusts in texts