nix: Make nix the root

Which means now I'll have to think about real prefixes in commit names.

unprocessed/config/khard/khard.conf

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+# example configuration file for khard version >= 0.11.0
+# place it under $HOME/.config/khard/khard.conf
+
+[addressbooks]
+[[contacts]]
+path = ~/.cache/vdirsyncer/contacts/contacts/
+
+[general]
+debug = no
+default_action = list
+editor = nvim
+merge_editor = nvim
+
+[contact table]
+# display names by first or last name: first_name / last_name
+display = first_name
+# group by address book: yes / no
+group_by_addressbook = no
+# reverse table ordering: yes / no
+reverse = no
+# append nicknames to name column: yes / no
+show_nicknames = no
+# show uid table column: yes / no
+show_uids = yes
+# sort by first or last name: first_name / last_name
+sort = last_name
+# localize dates: yes / no
+localize_dates = yes
+
+[vcard]
+# extend contacts with your own private objects
+# these objects are stored with a leading "X-" before the object name in the vcard files
+# every object label may only contain letters, digits and the - character
+# example:
+#   private_objects = Jabber, Skype, Twitter
+private_objects = Jabber, Skype, Twitter
+# preferred vcard version: 3.0 / 4.0
+preferred_version = 3.0
+# Look into source vcf files to speed up search queries: yes / no
+search_in_source_files = no
+# skip unparsable vcard files: yes / no
+skip_unparsable = no
+