This is also available in-game (Menu > shortcuts), but here's a rundown of all the keyboard shortcuts you can use at the moment:

CTRL LEFT & RIGHT: switch tabs
CTRL 1 - 5: draw from deck
F1: story tab
F2: account dialog
F3: history dialog
F4: options dialog
F5: character dialog

HOME: scroll to top of open card
BACKSPACE: close open card
ENTER: close played card
DELETE: discard card

A: play currently focused action
C: focus first action of open card
E: open explainer dialog for currently focused action
F: focus inventory filter field
S: open supply packet interface, if available
B: open bundling interface, if available

ESCAPE: close dialog box
F9: main menu
F11: full screen