Add new applications to the wiki

[soreau]

The wiki has a section for wf-panel, wf-dock and wf-background but now sections for the newly added wf-locker and wf-stream-chooser applications. The sections should outline how to install and configure them. For wf-stream-chooser, something like this might be included:

Put the following text into file ~/.config/xdg-desktop-portal-wlr/config

[screencast]
output_name=HDMI-A-1
max_fps=30
#chooser_cmd=slurp -f 'Monitor: %o' -or
chooser_cmd=wf-stream-chooser
chooser_type=simple

Run these commands:

dbus-update-activation-environment --systemd WAYLAND_DISPLAY DISPLAY XAUTHORITY WAYFIRE_SOCKET XDG_CURRENT_DESKTOP=wayfire
systemctl --user restart xdg-desktop-portal-wlr