Add Youtube Links to Presentations & Demos page

[DraxIndustries79]

Story

LOVE the buttons for the Hyku YouTube and the old Hydra-in-a-Box YouTube! Right now the buttons aren't linking to anything for me though.

Acceptance

• [x] Hyku YouTube Channel button links to: https://www.youtube.com/channel/UC_m1Ovaaasa2ksyGaqz5i0Q/
• [x] Hydra-in-a-Box button links to: https://www.youtube.com/channel/UC1eopKtm-k_f93RTfzHSvMQ