chore: remove broken link (#2410)

Removing broken link

Author: valentinvieriu

README.md

@@ -24,7 +24,6 @@ Check out our docs at https://vuepress.vuejs.org/.
 ## Showcase
 
 - [Awesome VuePress](https://github.com/vuepressjs/awesome-vuepress)
-- [vuepress.gallery](https://vuepress.gallery) (by [@vicbergquist](https://twitter.com/vicbergquist))
 - [vuepress.tools](https://vuepress.tools/) (By [Ahmad Mostafa](https://ahmadmostafa.com))
 
 ## Contribution