Update subcommittee lists

Subcommittee list needs updating, as per Serah Rono's @serahrono email from 2019-06-24:

1. Website and Outreach (incl merchandise)

Serah Rono (staff liaison)

2. Communication

Serah Rono (staff liaison)

3. Budget

Sher! (staff liason)
Serah Rono (staff liaison)
Elizabeth Williams (staff liaison)

4. Program

Sher! (Staff Liason)

5. Content development

Sher! (Co-chair)
Serah Rono (staff liaison)

6. Accessibility

Sher! (Staff liason)

Start by locating the existing subcommittee list in the repository and compare it with the names and roles in this issue, which cites Serah Rono's 2019-06-24 email. Done means the list reflects the six subcommittees and their listed staff or co-chair roles; no file or test is identified in the payload.

Written by the indexing model from the issue text.