Remove unnecessary design
Add skel of web preview
New feature: #2
go fmt
Allow `property` fron source tags
Fix layout bug
Allow `no-image` preview
Fix design
Allow `no-description` preview
Fix bug: do not pick up `twitter:image:width`
Fix design: #21
Fix bug: do not pick up `TileImage`
Merge pull request #22 from otiai10/ws/web-preview

web preview #2