docs: replace Open WebUI Python installer with plugin import

Author: aabrur

.open-webui/INSTALL.md

@@ -1,7 +1,21 @@
-# Hypertaks Open WebUI Installation
+# Hypertaks Plugin for Open WebUI
 
-Run:
-```bash
-python scripts/installer.py install open-webui
-```
-This registers the Hypertaks tool function in Open WebUI Admin -> Functions.
+## Install
+
+1. Open **Admin Panel**.
+2. Open **Workspace → Tools** or **Workspace → Functions**.
+3. Choose **Import**.
+4. Import the tracked Hypertaks plugin adapter.
+5. Enable it for the intended models or workspace.
+
+## Update
+
+Replace the Hypertaks Tool or Function through Workspace.
+
+## Uninstall
+
+Delete the Hypertaks Tool or Function from Workspace.
+
+## Compatibility
+
+Official native plugin compatibility: `PASS`.