Improve git configuration

Author: andyone

.gitconfig

@@ -1,6 +1,6 @@
 [core]
   excludesfile = ~/.gitignore
-  pager = less -x1,5
+  pager = less -x1,3
 
 [init]
   defaultBranch = master
@@ -25,7 +25,7 @@
   ci = commit
   br = branch
   co = checkout
-  df = diff
+  df = diff --staged
   lg = log --color --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit
 
 [gitflow "branch"]