modify css: hide href content on printing
modify css: hide href content on printing

on printing, href content appeared. 
it is caused by bootstrap.css

https://github.com/takezoe/gitbucket/blob/faae237ac522c1824eff09b9da5e9ec7b91d8fa3/src/main/webapp/assets/vendors/bootstrap/css/bootstrap.css#L183-L185
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