Revert "help-docs: Revise the article on searching for messages."
Revert "help-docs: Revise the article on searching for messages."

This reverts commit 8410990c42df92942de43244cc425c2998fd54e0.

We'd like to rework this article more substantially.

zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip