Implement chapter context related functionality

[arkid15r]

Make NestBot to be able to answer questions like:

• What is an OWASP Chapter?
• How can I find my nearest OWASP Chapter?
• How many OWASP chapters are there worldwide?
• Where can I see a list of all OWASP chapters?
• Where can I see a map of OWASP chapters?
• What's the difference between an OWASP project and a chapter?
• How do I join an OWASP chapter?
• How do I contact the OWASP chapter X leader?
• How do I start a new OWASP chapter?
• What support does OWASP provide for new chapter leaders?
• Can a university host an OWASP chapter?

Advanced:

• What is my nearest OWASP Chapter? (requires user's input)
• Are there OWASP events near me this month?
• When is the next OWASP chapter X meeting?
• Is there a Slack channel for OWASP chapter X?