Generate default image for stocks that is displayed if no picture is uploaded.

[komizutama]

Currently, If a user creates a stock but does not upload an image there is a blank space. This should be replaced by an image.

Acceptance Criteria

• Create an image to act as default for stock items without an uploaded image.
• No words or letters in the image.
• Color should be neutrals/grays
• Modify codebase so that stock items without an uploaded image display the graphic.
• Prefer svgs

Stretch Goals

• Create several default images {"carb", "protein", "vegetable", "prepacked package", "extras", & "full meals"}
• Colors Pallettes should coordinate/compliment with standards set for protein carbs and vegetable.
• Enable matching of image based on stock type.