site: bump plugin count in home (#591)

Signed-off-by: Ahmet Alp Balkan <[email protected]>

Author: ahmetb

site/content/_index.md

@@ -11,7 +11,7 @@ Krew helps you:
 - install them on your machine,
 - and keep the installed plugins up-to-date.
 
-There are [over 80 kubectl plugins][list] currently distributed on Krew.
+There are [over 90 kubectl plugins][list] currently distributed on Krew.
 
 Krew works across all major platforms, like macOS, Linux and Windows.