Merge docs into static-php-cli repo (#492)

* Move docs to here

* Move docs to here

* Modify old docs links

docs/.vitepress/theme/index.ts

@@ -0,0 +1,16 @@
+// docs/.vitepress/theme/index.ts
+import DefaultTheme from 'vitepress/theme'
+import {inBrowser, useData} from "vitepress";
+import {watchEffect} from "vue";
+
+export default {
+    ...DefaultTheme,
+    setup() {
+        const { lang } = useData()
+        watchEffect(() => {
+            if (inBrowser) {
+                document.cookie = `nf_lang=${lang.value}; expires=Mon, 1 Jan 2024 00:00:00 UTC; path=/`
+            }
+        })
+    }
+}