ISSUE #440: Update "who are we?" page
ISSUE #440: Update "who are we?" page

Descriptions of the changes in this PR:

- add new DL PPMC members to BK PMC
- fix full name and affiliations for a few members

Author: Sijie Guo <sijie@apache.org>

Reviewers: Matteo Merli <mmerli@apache.org>

This closes #447 from sijie/issue_440-, closes #440

ivankelly/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,apache/bookkeeper,apache/bookkeeper,ivankelly/bookkeeper,apache/bookkeeper,sijie/bookkeeper,apache/bookkeeper,apache/bookkeeper,sijie/bookkeeper,apache/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,ivankelly/bookkeeper,sijie/bookkeeper