Remove Member & Position Strikethrough

[hernandezforges]

Alexandre Steinhauslin is no longer a member of the Core Team, so their image and info needs to be removed from the team section on the About page. Along with removing the strikethrough of their position from the opportunities section on the About page.

[MonstersInc-sudo]

I can't create branches on opensac.org. Fork made with task resolved.
https://github.com/MonstersInc-sudo/opensac.org