Configure mackup

- ignore apps whose config files are in the dotfiles repo already
  (see: https://gitlab.webartifex.biz/alexander/dotfiles)
- ignore ~/.password-store as it contains symlinks
- sync various (config) files that are not be public:
  + Cisco's AnyConnect
  + history files for bash, less, python, psql, tig, and zsh
  + Gnome Nautilus' bookmarks
  + SSH config

.mackup.cfg

@@ -0,0 +1,25 @@
+[storage]
+engine = file_system
+path = /home/alexander/data/getraenkemarkt
+directory = mackup
+
+[applications_to_ignore]
+# Do not sync configuration files managed by
+# https://gitlab.webartifex.biz/alexander/dotfiles
+
+bash
+bat
+git
+flameshot
+mackup
+neofetch
+p10k
+pgsql
+poetry
+ssh
+vim
+zsh
+
+# Do not sync ~/.password-store as it contains symlinks
+# that Nextcloud does NOT support
+pass