feat: Add local setup screenshots to documentation

- Add bundle install screenshot for local setup
- Re-use API test generation screenshot for local setup
- Update Docker setup screenshots with latest versions

Signed-off-by: Atul Chahar <chaharatul92@gmail.com>

Author: Atul-Chahar

static/img/sinatra-postgres/bundle-install.png

@@ -129,6 +129,9 @@ You can also check the test summary from your CLI.
 bundle install
 ```
 
+![Bundle Install Sinatra](/img/sinatra-postgres/bundle-install.png)
+
+
 2. **Set up environment variables:**
 
 ```bash
@@ -153,6 +156,9 @@ keploy record -c "bundle exec ruby app.rb"
 
 Then make API calls as shown above.
 
+![Generate Testcases Sinatra](/img/sinatra-postgres/generate-testcases-sinatra.png)
+
+
 ### Run Tests
 
 ```bash