Revert "add a "back to all posts" button outside the editor"

This reverts commit c6d6da6fe25952cf193fef4143d23cf378b1b0e7.
Revert "make a naïve pull-out style"

This reverts commit 04e0d5320aae3209a66924a54cf1517efb2af99a.
put "back to my posts" link at the top of sidebar
Merge pull request #10 from rocodev/t1709-v2

put "back to my posts" link at the top of sidebar