[nvim] Add table align plugin; update spell

Added alignment plugin. My primary use-case is markdown tables, though
the plugin can be used for a lot more than that.

Basic use is marking the to-be-aligned area and pressing ga then
entering *| (or something else than pipe, if the separator symbol is
different). Or doing e.g. gaip to align within paragraph; works as
editing command.

nvim/.config/nvim/spell/en.utf-8.add

@@ -34,3 +34,5 @@ artifactual
 autarky
 Kyrgyzstan
 UNSC
+plugin
+Solidarność