Tweaks to entry content styles

[andersnoren]

Minor updates to entry content/block styles to fix issues discovered when creating the block styles. Includes the following adjustments:

• Removed CSS setting all .entry-content a elements to the serif font stack, resulting in links within figcaption, headings and other sans-serif elements having serif links
• Fixed the color of the button outline not being correct when no accent color is set
• Set the font size of left/right aligned .wp-block-pullquote.is-style-solid-color blockquote p to overwrite the default block-styles properties
• Fixed alignleft/alignright not being aligned correctly between 480px and 660px
• Make H6 uppercase
• Update drop-cap font size
• Use font-family: inherit instead of a full font stack where possible (cover block paragraph)
• Set file button style to match other button styles
• Updated the overall style of file blocks
• Set video elements to display: block to fix margin issues with figcaptions
• Add the base block margins to: .wp-block-video, .wp-block-code, .wp-block-verse, .wp-block-preformatted (3rem vertical on mobile, 5rem vertical on tablet and up)
• Increase margin between time and excerpt on Recent Entries block widget
• Increase margin between avatar and article on Recent Comments block widget (only when .has-avatars is set on body)

[ianbelanger79]

LGTM