✏️docs: add tavily to env.example and dotenv.md (#1866)

* update .env.example

add "TAVILY_API_KEY=" to .env.example

* update dotenv.md

add Tavily to dotenv.md

.env.example

@@ -183,6 +183,10 @@ SERPAPI_API_KEY=
 #-----------------
 SD_WEBUI_URL=http://host.docker.internal:7860
 
+# Tavily
+#-----------------
+TAVILY_API_KEY=
+
 # WolframAlpha
 #-----------------
 WOLFRAM_APP_ID=
@@ -331,4 +335,4 @@ FIREBASE_APP_ID=
 # SHOW_BIRTHDAY_ICON=true
 
 # E2E_USER_EMAIL=
-# E2E_USER_PASSWORD=
+# E2E_USER_PASSWORD=

docs/install/configuration/dotenv.md

@@ -514,6 +514,13 @@ See detailed instructions here: **[Stable Diffusion](../../features/plugins/stab
 SD_WEBUI_URL=http://host.docker.internal:7860
 ```
 
+### Tavily
+Get your API key here: [https://tavily.com/#api](https://tavily.com/#api)
+
+```bash
+TAVILY_API_KEY=
+```
+
 #### WolframAlpha
 See detailed instructions here: **[Wolfram Alpha](../../features/plugins/wolfram.md)**