Edit issue title and description UI

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Design

• Edit button moves to title/description area (we can perhaps looks towards using an icon for this.. similar to comments) moved to gitlab-ce#37474
• Title and description edit areas are combined in one editor
• Save and cancel buttons remain the same
• Edit button is no longer visible
• Move project and confidentiality checkbox are removed
• In preview mode, you shouldn't be able to edit the title or change the template

neutral write mode:

write mode:

preview mode (title rendered as h1 tag):