Remove tailing slash (#157)

If user access /dashboard in some environments that do not handle
redirection, the page will not be visible. This commit solves the
problem by removing the trailing slash from base.

vite.config.ts

@@ -6,6 +6,6 @@ import svgr from 'vite-plugin-svgr';
 import tsconfigPaths from 'vite-tsconfig-paths';
 
 export default defineConfig({
-  base: '/dashboard/',
+  base: '/dashboard',
   plugins: [react(), commonjs(), svgr(), tsconfigPaths()],
 });