Make Wiki editing content area larger

The problem

The current Wiki editor is too small. In its default state, it uses about 1/2 of screen vertically and about 1/3 of screen horizontally (1920*1080 screen). The rest is either unused or taken by elements which are not important for editing, or can be arranged better.

Surprisingly, the most important buttons save/cancel are scrolled away. "Full screen" button is not useful at all because it lacks all critical elements (save, cancel, preview) and when I return the edit becomes 7 lines high.

Proposal

Change the content editing area in the Wiki’s edit page to occupy the available vertical space. We will only be able to implement this change once we move the commit message field and the action buttons to the top of the page.

Proposed UI Source Editing	Proposed UI rich editing

~"feature proposal"

Availability and Testing

Please run package-and-qa for regression purposes.

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