Added page IDs

Modified classes on all pages to simply "page" then added ID's for "page1:, "apge2", etc. Updated the CSS to target ID instead of class for page 2 overide.
Added IDs to table cells on estimate page

Added ID's on the table cells to output estamate costs to the appropriate cells.
Added mixin for creating circles

SASS mixin for creating a circle with text inside
Added error states for input and nav btns

Added CSS classes for error states on imput fileds (must be placed on the label containg the field) and navigation buttons.
Created CSS for inactive nav btn

Added inactive navigation button class