Add videos

Things to add in:

• https://www.meetup.com/youhadonefintechjob/events/?type=past
• https://www.youtube.com/watch?v=SGAxf8dOge8 – music
• https://www.youtube.com/watch?v=xEov3ov8COc – UCL
• https://www.youtube.com/watch?v=Uqi74uu79iA – 11FS