fix(docs): silence TS 6 deprecation for baseUrl in twoslash

Twoslash's virtual TS env sets baseUrl in its default compiler options,
and TS 6 errors on it. Pass `ignoreDeprecations: '6.0'` through
twoslashOptions.compilerOptions so the doc build's snippet compilation
stops failing. Also remove the unused baseUrl from docs/tsconfig.json.

Author: antfu

docs/.vitepress/config.ts

@@ -70,6 +70,7 @@ export default defineConfig({
           compilerOptions: {
             resolveJsonModule: true,
             moduleResolution: /* Bundler */ 100,
+            ignoreDeprecations: '6.0',
           },
         },
       }),

docs/tsconfig.json

@@ -3,7 +3,6 @@
     "target": "ESNext",
     "jsx": "preserve",
     "lib": ["DOM", "ESNext"],
-    "baseUrl": ".",
     "module": "ESNext",
     "moduleResolution": "bundler",
     "resolveJsonModule": true,