Feature/sc 29344/sheet header

[stevekaplan123]

Description

This PR creates the new header for the sheet viewer. It displays a title, sheet summary, user profile picture, and user profile name.

Code Changes

1. Currently, a component called SheetMetaDataBox is used to display metadata for sheets. I re-appropriated this component to use for the header. The advantage of doing this is that its corresponding CSS was easy to find and remove/modify.
2. I took the component SheetTitle, which was previously used with SheetMetaDataBox, copied and adapted it slightly to display either the title or summary. It's called SheetMetaDataBoxSegment. I wasn't sure if this was a good idea. The advantage of re-using code from SheetTitle is that it will be (a) editable when used for the header of the Sheet Editor, (b) it strips HTML from the text, and (c) displays in the right direction based on the hebrew/english content of its text
3. The rest of the code of this PR simply removes CSS no longer needed for .sheetMetaDataBox.