Add dumpsite index.

[config] / buster / home_files / user / .notmuch-config

[database]
path=/home/plom/mail
[search]
exclude_tags=deleted;spam;
# the fields below set the From: if the mail composer is called from
# within notmuch
[user]
name=Christian Heller
primary_email=plom@plomlompom.com