Revert "webapp/files: details around links + help for sharing files"
Revert "webapp/files: details around links + help for sharing files"

This reverts commit ba9c93f450b6b7709c9819421a2af7595ab373aa.

tscholl2/smc,sagemathinc/smc,DrXyzzy/smc,sagemathinc/smc,tscholl2/smc,DrXyzzy/smc,tscholl2/smc,tscholl2/smc,DrXyzzy/smc,sagemathinc/smc,DrXyzzy/smc,tscholl2/smc,sagemathinc/smc