Create new project: Re-add project name field

Problem to solve

Right now, when creating a new project, the actual project name is not available/editable.
The initially shown "Project name" field is storing the normalized project handle/URL. The label is incorrect.

The primary field is the project URL and we should keep it that way.
But I think we can allow showing an optional repo name on the new project screen.

Personally, I missed it when I created my last project.

/cc @dzaporozhets @skyruler

Further details

Report https://twitter.com/DanielCardoso/status/650283111973044225

Solution

Project name blank, autofocused	Project name filled, project handle auto generated

• We start with 'Project name' and automatically generate the 'Project slug' as the user types the name.
• The automatically generated slug is converted to lowercase and dash-delimited.
• the 'Project slug' input field remains editable
• The 'Project name' input field should be autofocused on page load (doesn't apply to mobile devices, if possible)
• 'Project path' should be renamed to 'Project URL'

Mobile design:

What does success look like, and how can we measure that?

Less users reporting their problems with changing the project name.