rustdoc: remove unneeded .content selector from link colors

Since 98f05a0282 and
b5963f07e6 removed color classes from sidebar
items, there's no need for the selectors to be so specific any more.

This commit does have to change `h1.fqn a` to just be `h1 a`, so that the
header link color selector is less specific than the typed link at the end.
Since #89506 made docblocks start at `h2`, the main page link header should
be the only h1 in the page now.

src/librustdoc/html/static/css/rustdoc.css

@@ -218,55 +218,55 @@ pre.rust a,
 .sidebar h2 a,
 .sidebar h3 a,
 .mobile-topbar h2 a,
-h1.fqn a,
+h1 a,
 .search-results a,
 .module-item .stab,
 .import-item .stab,
 .result-name .primitive > i, .result-name .keyword > i,
-.content .method .where,
+.method .where,
-.content .fn .where,
+.fn .where,
-.content .where.fmt-newline {
+.where.fmt-newline {
 	color: var(--main-color);
 }
 
-.content span.enum, .content a.enum,
+span.enum, a.enum,
-.content span.struct, .content a.struct,
+span.struct, a.struct,
-.content span.union, .content a.union,
+span.union, a.union,
-.content span.primitive, .content a.primitive,
+span.primitive, a.primitive,
-.content span.type, .content a.type,
+span.type, a.type,
-.content span.foreigntype, .content a.foreigntype {
+span.foreigntype, a.foreigntype {
 	color: var(--type-link-color);
 }
 
-.content span.trait, .content a.trait,
+span.trait, a.trait,
-.content span.traitalias, .content a.traitalias {
+span.traitalias, a.traitalias {
 	color: var(--trait-link-color);
 }
 
-.content span.associatedtype, .content a.associatedtype,
+span.associatedtype, a.associatedtype,
-.content span.constant, .content a.constant,
+span.constant, a.constant,
-.content span.static, .content a.static {
+span.static, a.static {
 	color: var(--assoc-item-link-color);
 }
 
-.content span.fn, .content a.fn,
+span.fn, a.fn,
-.content .fnname,
+.fnname,
-.content span.method, .content a.method,
+span.method, a.method,
-.content span.tymethod, .content a.tymethod {
+span.tymethod, a.tymethod {
 	color: var(--function-link-color);
 }
 
-.content span.attr, .content a.attr,
+span.attr, a.attr,
-.content span.derive, .content a.derive,
+span.derive, a.derive,
-.content span.macro, .content a.macro {
+span.macro, a.macro {
 	color: var(--macro-link-color);
 }
 
-.content span.mod, .content a.mod, .block a.current.mod {
+span.mod, a.mod {
 	color: var(--mod-link-color);
 }
 
-.content span.keyword, .content a.keyword {
+span.keyword, a.keyword {
 	color: var(--keyword-link-color);
 }
 
@@ -685,9 +685,9 @@ pre, .rustdoc.source .example-wrap {
 }
 
 /* Shift "where ..." part of method or fn definition down a line */
-.content .method .where,
+.method .where,
-.content .fn .where,
+.fn .where,
-.content .where.fmt-newline {
+.where.fmt-newline {
 	display: block;
 	font-size: 0.875rem;
 }

src/librustdoc/html/static/css/themes/ayu.css

@@ -56,7 +56,7 @@ input:focus + .slider {
 h1, h2, h3, h4 {
 	color: white;
 }
-h1.fqn  a {
+h1 a {
 	color: #fff;
 }
 h4 {