Styles update

# Changes 

## assets 
* added provided images in both standard and retina resolutions

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## index.html 
* added svg's for arrows
* sign-up/sign-in/settings views
  * altered display divs into readonly input containers
* added new fonts (cubano and proxima nova)
* changed a number of h3's into h1's for visibility with new font
* added h1-flag class to all banners for styling

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## router.js
* added groupID to call back for player view route

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## player-view.js
* dynamically rendering player name and group

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## settings-view.js 
* display divs altered into dynamic input fields
* buttons swap from edit to save
* input fields switch from readonly to editable based on if edit is pressed
* success/error notifications in dom when "saving" email or password change requests

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## user-nav-view.js
* organization name in the upper right corner will now automatically capitalize the first letter of the name.

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## variables.scss 
* a number of colors added to correspond with updated assets
  * $colorCharcoal
  * $colorCharcoalDark
  * $colorTextCharcoal
  * $colorCoral
  * $colorSuccessGreen
  * $colorButtonTeal

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## main.scss
* updates for any of the above dom elements - mainly settings, sign-in, and sign-up views.
* refactored certain class selectors for condensed code - namely tables.