kitchen sink...

just gonna put the changes that I can remember making here:
 - replace blink with native completion (omnifunc)
 - remove some unneeded plugins
 - add a misc function for making sure complex bindings don't cause
   flickering
 - remove some stale snippets
 - remove folding (I don't find myself folding that often)

after/plugin/colorscheme.lua

@@ -1,5 +1,5 @@
 if vim.fn.has("termguicolors") and not os.getenv("TERM") ~= "linux" then
-  vim.cmd("colorscheme mellow")
+  vim.cmd("colo mellow")
 else
-  vim.cmd("colorscheme default")
+  vim.cmd("colo default")
 end