Simpler way to prevent flushing updates on server

Test Plan: Only failing tests in jest are immutable tests that were already failing.

(cherry picked from commit 6259d88f0352f0ab4388412122d5c911a6fb9329)
[docs] increase base font-weight

Closes #1926

(cherry picked from commit eb8f7660056ccc9a54ca4fc66220c351c2e35bdf)