chore: update readme install cmd (#14)

* chore: update readme install cmd

* Update tutorials/quickstart.md

Author: averikitsch

README.md

@@ -17,7 +17,7 @@ Learn more about [Gemini CLI Extensions](https://github.com/google-gemini/gemini
 
 Before you begin, ensure you have the following:
 
-*   [Gemini CLI](https://github.com/google-gemini/gemini-cli) installed with version +v0.6.0.
+*   [Gemini CLI](https://github.com/google-gemini/gemini-cli) installed with version **+v0.6.0**.
 *   A running PostgreSQL instance.
 *   User are granted database-level permissions to execute queries.
 
@@ -26,7 +26,7 @@ Before you begin, ensure you have the following:
 To install the extension, use the command:
 
 ```bash
-gemini extensions install github.com/gemini-cli-extensions/postgres
+gemini extensions install https://github.com/gemini-cli-extensions/postgres
 ```
 
 ## Configuration

tutorials/quickstart.md

@@ -26,7 +26,7 @@ Gemini CLI includes a pre-built extension for connecting to any PostgreSQL datab
 1. Install the extension:
 
     ```bash
-    gemini extensions install github.com/gemini-cli-extensions/postgres.git
+    gemini extensions install https://github.com/gemini-cli-extensions/postgres
     ```
 
 ## Configuration