chore: remove 2.10~2.15 versions (#431)

移除 2.10～2.15 的文档，已经将 2.10～2.15 的文档转移到 https://v2.archive-docs.halo.run/

```release-note
None
```

Author: ruibaby

docusaurus.config.js

@@ -43,17 +43,7 @@ const config = {
         sitemap: {
           changefreq: "weekly",
           priority: 0.5,
-          ignorePatterns: [
-            "/2.10/**",
-            "/2.11/**",
-            "/2.12/**",
-            "/2.13/**",
-            "/2.14/**",
-            "/2.15/**",
-            "/2.16/**",
-            "/2.17/**",
-            "/2.18/**",
-          ],
+          ignorePatterns: ["/2.16/**", "/2.17/**", "/2.18/**", "/2.19/**"],
         },
         googleAnalytics: {
           trackingID: "UA-110780416-7",
@@ -239,12 +229,6 @@ const config = {
         createRedirects(existingPath) {
           if (existingPath.startsWith("/2.20.0-SNAPSHOT/")) {
             return [
-              existingPath.replace("/2.20.0-SNAPSHOT/", "/2.10.0-SNAPSHOT/"),
-              existingPath.replace("/2.20.0-SNAPSHOT/", "/2.11.0-SNAPSHOT/"),
-              existingPath.replace("/2.20.0-SNAPSHOT/", "/2.12.0-SNAPSHOT/"),
-              existingPath.replace("/2.20.0-SNAPSHOT/", "/2.13.0-SNAPSHOT/"),
-              existingPath.replace("/2.20.0-SNAPSHOT/", "/2.14.0-SNAPSHOT/"),
-              existingPath.replace("/2.20.0-SNAPSHOT/", "/2.15.0-SNAPSHOT/"),
               existingPath.replace("/2.20.0-SNAPSHOT/", "/2.16.0-SNAPSHOT/"),
               existingPath.replace("/2.20.0-SNAPSHOT/", "/2.17.0-SNAPSHOT/"),
               existingPath.replace("/2.20.0-SNAPSHOT/", "/2.18.0-SNAPSHOT/"),