FOLIO platform color contrast updates

Per several schools, the platform's current color contrast makes it difficult to use the UI.
Feedback from UChicago: "The transparency settings that are default on the FOLIO display make it difficult to interact with large chunks of text as within Inventory. Also, Headings and values are not differentiated in the display. Users should be able to easily distinguish between Headings / Labels and content that is association with those locals. Current fixed settings make it difficult to determine what is a heading and what is the value."

From Chalmers: "Grey on grey is too subtle for color differences; need more distinction between field labels and field data; need blue text to be more distinct from grey text."

Changes must be in compliance with WCAG 2.1 Priority AA Color Contrast requirements which are the following: "The visual presentation of text and images of text has a contrast ratio of at least 4.5:1." Read more at https://www.w3.org/WAI/WCAG21/quickref/#contrast-minimum.