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/lsp/clangd.lua

@@ -1,12 +1,4 @@
-local map = core.misc.map
-
 return {
-  on_attach = function(_, bufnr)
-    -- add some clangd specific mappings
-    local opts = { buffer = bufnr }
-    map("n", "<leader>o", "<cmd>ClangdSwitchSourceHeader<CR>", opts)
-  end,
-
   cmd = {
     "clangd",
     "--background-index",