Update fonts.conf

CHANGES
. Modifies configuration for sans-serif
. Removes hinting configuration for Segoe UI
. Adds configurations to use bitmap only (disables hinting) for below
  gulim.ttc
  batang.ttc
  tahoma.ttf
. Adds .gitignore for this repository

TODO
Need to use hinting for large size of {gulim,batang}.ttc and tahoma.ttf

KNOWN ISSUE
If /etc/fonts/conf.d/??-infinality.conf is later than
/etc/fonts/conf.d/??-user.conf, fonts.conf won't affect anything.
This is noted in newly added file by this change - NOTE

Signed-off-by: Kwanhong Lee <kwanhong.lee@gmail.com>