* docs: add three new case studies to README
- Add Unitree G1 Humanoid Robot security analysis case study
- Add Dragos OT CTF 2025 Top-10 achievement case study
- Add HackerOne bug bounty platform case study
- Include case study images in docs/assets/images/
- Position new studies at the top as most recent
- Maintain consistent formatting with existing case studies
* docs: update case study descriptions with official text from web pages
- Update Unitree G1 description with official text
- Update Dragos CTF description with official text
- Update HackerOne description with official text
- Ensure consistency with published case studies
* docs: add PortSwigger case study to maintain 2-column structure
- Add PortSwigger Web Security Academy case study
- Position alongside MQTT broker in last row
- Maintain consistent 2-column layout throughout
- Include case study image in docs/assets/images/
* docs: update HackerOne case study title
- Remove 'and alias1' reference from HackerOne title
- Keep consistent naming with other case studies
danielsanchezprieto01