refactor: remove vimwiki

after/plugin/snips/markdown.lua

@@ -1,21 +0,0 @@
-if not pcall(require, "luasnip") then
-	return
-end
-
-local ls = require("luasnip")
-
-local s = ls.snippet
-local i = ls.insert_node
-local t = ls.text_node
-local c = ls.choice_node
-local fmt = require("luasnip.extras.fmt").fmt
-
-ls.add_snippets({ "markdown", "vimwiki" }, {
-	s(
-		"t",
-		fmt("- [{}] {}", {
-			c(2, { t(" "), t("-"), t("x") }),
-			i(1, "task"),
-		})
-	),
-})