chore(OpenGraph): add site name

Author: camera-2018

.vitepress/config.js

@@ -22,6 +22,7 @@ export default withMermaid({
     ["meta", { "name": "viewport", "content": "width=device-width,initial-scale=1" }],
     ["meta", { "property": "og:url", "content": "https://hdu-cs.wiki/" }],
     ["meta", { "property": "og:type", "content": "website" }],
+    ["meta", { "property": "og:site_name", "content": "HDU-CS-WIKI" }],
     ["meta", { "property": "og:title", "content": "HDU-CS-WIKI | HDU-CS-WIKI" }],
     ["meta", { "property": "og:description", "content": "HDU计算机科学讲义" }],
     ["meta", { "property": "og:image", "content": "https://cdn.xyxsw.site/og-img.png" }],