Added top, left, bottom and right floating windows alignement (#1169)

* feat: added top, left, bottom, right alignement options

* feat: implemented extra alignement

* feat: added example

* doc: updated documentation with extra alignements

* doc: moved example in wiki and typo correction

* fix: relative position should be positive and not negative

* fixes

---------

Co-authored-by: Martino Ferrari <martinogiordano.ferrari@iter.org>
Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

niri-config/src/lib.rs

@@ -1355,6 +1355,10 @@ pub enum RelativeTo {
     TopRight,
     BottomLeft,
     BottomRight,
+    Top,
+    Bottom,
+    Left,
+    Right,
 }
 
 #[derive(Debug, Default, PartialEq)]