Deprecated /(un)follow commands and respective usercard action (#3078)

/(un)follow commands are marked as deprecated and link to the issue this PR is closing.
follow button on the usercard is removed completely

Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>
Co-authored-by: Felanbird <41973452+Felanbird@users.noreply.github.com>

src/widgets/dialogs/UserInfoPopup.hpp

@@ -59,7 +59,6 @@ private:
         Label *followageLabel = nullptr;
         Label *subageLabel = nullptr;
 
-        QCheckBox *follow = nullptr;
         QCheckBox *block = nullptr;
         QCheckBox *ignoreHighlights = nullptr;