add OSSF to special thanks
Merge pull request #44 from l34marr/tutorial

Update Tutorial Messages.
add en BoF page
tweak layout
fix lang of link to sponsor info
[what] Add Sponsor Complimentary Passes information

[why] need it
Merge pull request #47 from AlfredWei/master

update sponsor info

Add sponsor complimentary passes information
Instant update to some html codes.
Tiny update to 贊助須知.
Merge pull request #48 from drakeguan/fine-tune-sponsor-info

Fine tune sponsor info
fix indent
fix image url
fix html syntax, tweak layout
rephrase content before Q1
[ja] sponsor info is now at different page
[ja] add sponsor info first (in English)
add vpon in media sponsor
add en sponsor zillians and logo
add new sponsor acomotech eng and its logo
update zh sponsor intro