Replace Docusaurus with Fumadocs v10.1.2#414

Copilot wants to merge 2 commits intomasterapache/casbin-website-v2:masterfrom

copilot/replace-docusaurus-with-fumadocs-againapache/casbin-website-v2:copilot/replace-docusaurus-with-fumadocs-againCopy head branch name to clipboard