Rename Secure Section to AppSec

Mentioned in the Secure Section Group Conversation and in Slack, Secure is not MECEFU because it refers both to a Section and a Stage. This proposal is to update the Secure Section to be called AppSec. The Secure Stage will remain.

Some questions @kencjohnston has gotten illustrating the confusion:

• "What's the difference between the Secure Section and the Secure Stage?"
• "At what level are Sections, are they aligned directly to stages or combinations of stages."

Approvals

• CEO - @sytses
• VP of Product - @sfwgitlab
• VP of Product Strategy - @markpundsack
• Director of Product - @kencjohnston
• Director of Engineering - @tstadelhofer

Informed

• Senior Director of Development - @clefelhocz1
• Director of Quality - @meks
• VP of Engineering - @edjdev