Fix section links styling for accessibility compliance

[AnastasiaLd]

Hi,

The styling applied to some of the section hyperlinks is not compliant with the current W3C's Web Content Accessibility Guidelines – WCAG2.

Ideally, the Boost theme accessible styling for links should be preserved.

Additionally, we noticed some inconsistency in the link styling format.

section#region-main p a {
    color: #14a9fe;
    text-decoration: underline;
    font-weight: 700;
}

a {
    color: #1c1c1c;
    text-decoration: none;
    background-color: transparent;
}

.format-tiles .embed_cm_modal a {
    color: #979797;
}