accessibility: color contrast for <h1> titles, <a> fail WCAG 2.0 minimum standards

[weedySeaDragon]

There are two main styles* that do not meet the minimum level of contrast between the foreground and background:

1. <h1> white foreground against a light blue background
2. <a> light blue foreground against a white background does not meet the WCAG 2.0 minimum standards for color contrast

(* "main style" == heavily used in the website. Perhaps there are some other styles, but these are the two that are prominent in the few pages I checked.)

The definitions in style.css:

a {
  color: #23aad1;
  text-decoration: none;
  transition: all 350ms ease; }
  a:active, a:focus, a:hover {
    color: #DC322F;
    text-decoration: underline; }

...

.title-page {
  background: #5CC6E4;
  min-height: 200px; }
  .title-page h1 {
    font-size: 1.875rem;
    font-family: "Lato", sans-serif;
    padding-top: 40px;
    text-transform: uppercase;
    text-shadow: rgba(0, 43, 54, 0.1) 2px 2px 0;
    color: #fff; }

References:

• Web Content Accessibility Guidelines (WCAG) 2.0 https://www.w3.org/TR/WCAG20/
• a nice list of standards (US 508, various international standards, WCAG etc), intro articles, etc: https://webaim.org/resources/
• a free tool to check if a page meets minimum WCAG 2.0 (accessibility) standards: http://wave.webaim.org/
  just enter the page URL and it runs checks and shows you what needs to be addressed

Example of what the WAVE tool shows for the Getting Started page:

[SethTisue]

if tempted to tackle this, see scala/scala-lang#891 (comment)

[weedySeaDragon]

In a scala/scala-lang#891 (comment) comment I encouraged @heathermiller to talk to the original site designer so that this can be addressed.

This is about meeting minimal, industry and globally accepted standards -- something important for all websites but especially critical for one so important as Scala so that the information can be shared with as many as possible.