docs(playground): [icon]adjust Github and Share icon size consistency (#2992)

Author: tsinghua-lau

examples/sites/playground/icons/Github.vue

@@ -1,7 +1,7 @@
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+      d="M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.387.6.113.82-.258.82-.577v-2.234c-3.338.724-4.033-1.416-4.033-1.416-.546-1.387-1.333-1.756-1.333-1.756-1.088-.744.083-.729.083-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.807 1.305 3.364.998.108-.788.418-1.305.762-1.604-2.665-.305-5.467-1.334-5.467-5.933 0-1.311.469-2.381 1.236-3.221-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.301 1.23A11.509 11.509 0 0112 5.803c1.02-.005 2.047.138 3.006.404 2.291-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.911 1.235 3.221 0 4.609-2.807 5.624-5.479 5.921.43.372.823 1.102.823 2.222v3.293c0 .319.218.694.824.576C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12z"
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