I'd suggest that if the visitor is aware of build.w.o, they're likely people we should involve directly in the production process (research, design, coding, etc.), and we should author a less wordy, more direct, and more "in-the-house" on-ramp to contributions we really want (and not, e.g. drive people to Popcorn).
build.w.o currently links to https://webmaker.org/en-US/getinvolved, which feels too shallow/broad; Clicking on code links to https://support.mozilla.org/en-US/kb/contribute-webmaker-code, which feels generally like a page we should review / throw away.
I'd suggest that if the visitor is aware of build.w.o, they're likely people we should involve directly in the production process (research, design, coding, etc.), and we should author a less wordy, more direct, and more "in-the-house" on-ramp to contributions we really want (and not, e.g. drive people to Popcorn).