update jj config to also have 'p' as a shortcut, and jj diff

dot_config/alacritty/alacritty.toml.tmpl

@@ -40,7 +40,7 @@ size = 19.0
 {{ else if eq .chezmoi.hostname "rosencrantz" -}}
 size = 15.0
 {{ else if eq .chezmoi.hostname "altair" -}}
-size = 20.5
+size = 22
 {{ else -}}
 size = 19.0
 {{ end }}
@@ -82,9 +82,13 @@ key = "U"
 mods = "Control|Shift"
 
 [[hints.enabled]]
-command = "xdg-open"
 post_processing = true
 regex = "(magnet:|mailto:|https:|http:|news:|file:|git:|ssh:|ftp:)[^\u0000-\u001F\u007F-Ÿ<>\"\\s{-}\\^⟨⟩`]+"
+{{if eq .chezmoi.os "darwin" -}}
+command = "open"
+{{ else -}}
+command = "xdg-open"
+{{ end }}
 
 [hints.enabled.binding]
 key = "L"