Added redirects

Author: dcpena

public/_redirects

@@ -1155,6 +1155,9 @@
 /r2/reference/changelog/index.xml /r2/platform/changelog/index.xml 301
 /r2/reference/limits/ /r2/platform/limits/ 301
 /r2/reference/metrics-analytics/ /r2/platform/metrics-analytics/ 301
+/r2/examples/mastodon/ /r2/tutorials/mastodon/ 301
+/r2/examples/postman/ /r2/tutorials/postman/ 301
+/r2/examples/cloudflare-access/ /r2/tutorials/cloudflare-access/ 301
 
 # style-guide
 /style-guide/formatting/symbols-in-ui-element-names/ /style-guide/formatting/ui-elements/ 301