home: vim: show diagnostics on hover

Ideally, I want the following features:
* diagnostic icons in the sign column always,
* virtual text on the current line only
* switch to hover window and/or lsp_lines display through a mapping

home/vim/plugin/settings/diagnostics.vim

@@ -15,3 +15,9 @@ vim.diagnostic.config({
     severity_sort = true,
 })
 EOF
+
+augroup DiagnosticsHover
+    autocmd!
+    " Show diagnostics on "hover"
+    autocmd! CursorHold,CursorHoldI * lua vim.diagnostic.open_float(nil, {focus=false, scope="cursor"})
+augroup END