Remove unused custom CSS

docs/_static/css/default.css

@@ -2,82 +2,3 @@
     text-align: left;
     padding: 0px, 0px, 5px, 5px;
 }
-
- .md-source {
-	 display: block;
-	 font-size: px2rem(13px);
-	 line-height: 1.2;
-	 white-space: nowrap;
-	 outline-color: var(--md-accent-fg-color);
-	 backface-visibility: hidden;
-	 transition: opacity 250ms;
-	 vertical-align: middle;
-}
- .md-source:hover {
-	 opacity: 0.7;
-}
- .md-source__icon {
-	 display: inline-block;
-	 width: px2rem(40px);
-	 height: px2rem(48px);
-	 vertical-align: middle;
-}
- .md-source__icon svg {
-	 margin-inline-start: px2rem(12px);
-	 margin-top: px2rem(12px);
-}
- .md-source__icon + .md-source__repository {
-	 padding-inline-start: px2rem(40px);
-	 margin-inline-start: px2rem(-40px);
-}
- .md-source__repository {
-	 display: inline-block;
-	 max-width: calc(100% - px2rem(24px));
-	 margin-inline-start: px2rem(12px);
-	 overflow: hidden;
-	 text-overflow: ellipsis;
-	 vertical-align: middle;
-}
- .md-source__facts {
-	 display: flex;
-	 gap: px2rem(8px);
-	 width: 100%;
-	 padding: 0;
-	 margin: px2rem(2px) 0 0;
-	 overflow: hidden;
-	 font-size: px2rem(11px);
-	 list-style-type: none;
-	 opacity: 0.75;
-}
- .md-source__repository--active .md-source__facts {
-	 animation: facts 250ms ease-in;
-}
- .md-source__fact {
-	 overflow: hidden;
-	 text-overflow: ellipsis;
-}
- .md-source__repository--active .md-source__fact {
-	 animation: fact 400ms ease-out;
-}
- .md-source__fact::before {
-	 display: inline-block;
-	 width: px2rem(12px);
-	 height: px2rem(12px);
-	 margin-inline-end: px2rem(2px);
-	 vertical-align: text-top;
-	 content: "";
-	 background-color: currentcolor;
-	 mask-position: center;
-	 mask-repeat: no-repeat;
-	 mask-size: contain;
-}
- .md-source__fact:nth-child(1n+2) {
-	 flex-shrink: 0;
-}
- .md-source__fact--stars::before {
-     content: url("../star-16.svg");
-     width: 12px;
-     height: 12px;
-     background-color: transparent;
-     margin: 0px 4px 0px 0px;
-}