Add Osaka Jade theme to default theme set. (#514)

* Add Osaka Jade Theme

* Use jpg for bg for lower size with no quality difference

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Co-authored-by: Justin Lowry <j.lowry@hey.com>
Co-authored-by: David Heinemeier Hansson <david@hey.com>

themes/osaka-jade/neovim.lua

@@ -0,0 +1,9 @@
+return {
+	"ribru17/bamboo.nvim",
+	lazy = false,
+	priority = 1000,
+	config = function()
+		require("bamboo").setup({})
+		require("bamboo").load()
+	end,
+}