Email blocklisting (#718)

* Interface complete for the email blacklisting

* Everything seems to work

* Neutralize language

* fix clippy warnings

* Add missing spaces

* Added matching test

* Correct primary key datatype for postgresql

* Address review comments

* Add placeholder when empty. Fix missing 'i'

src/main.rs

@@ -198,6 +198,9 @@ Then try to restart Plume
                 routes::instance::admin_mod,
                 routes::instance::admin_instances,
                 routes::instance::admin_users,
+                routes::instance::admin_email_blocklist,
+                routes::instance::add_email_blocklist,
+                routes::instance::delete_email_blocklist,
                 routes::instance::edit_users,
                 routes::instance::toggle_block,
                 routes::instance::update_settings,