feat: Remove h1 reset styles

See:
- whatwg/html#11102
- Chromium: https://issues.chromium.org/issues/394111284
- Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=1885509
- WebKit: https://bugs.webkit.org/show_bug.cgi?id=292765

Author: germanfrelo

base.css

@@ -82,16 +82,6 @@ body {
 /* Headings
 ================================================== */
 
-/*
-Ensure consistent 'h1' rendering.
-Ref. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Heading_Elements#specifying_a_uniform_font_size_for_h1
-*/
-
-:where(h1) {
-	margin-block: 0.67em;
-	font-size: 2em;
-}
-
 /*
 The default 'normal' line-height is tightly spaced, but takes font metrics into account, which is important for many fonts. Looser spacing may improve readability in latin type, but may cause problems in some scripts -- from cursive/fantasy fonts to Javanese, Persian, and CJK languages.
 */