scripts: Add script to read wallabag articles

Added script to easily read wallabag articles on the command line (or
open them in browser), using the wallabag-cli python program in the
background.

Once invoked, will fetch a list of articles (optionally restricted to
read/unread/starred), and allow a choice through fzf.

Will then display the article in the user's preferred pager, editor, or
browser.

Can be invoked through the shell via `reader`, or through sxhkd shortcut
`r` from 'academia' mode (`alt + a`).

sxhkd/.config/sxhkd/sxhkdrc

@@ -84,3 +84,6 @@ alt + a : shift + {F1,F2}
   rofi-bib-due -p{1,3}
 alt + a : F3
   rofi-bib-due
+
+alt + a : r
+  alacritty --class floating,floating -e reader -n