neovim: fix a bunch of small issues

- snack explorer now opens on the neovim is open at instead of the go
module
- remove obsolete linting stuff

neovim/dot-config/nvim/lua/plugins/lint.lua

@@ -0,0 +1,11 @@
+return {
+  {
+    "mfussenegger/nvim-lint",
+    optional = true,
+    opts = {
+      linters_by_ft = {
+        sql = { "sqlfluff" },
+      },
+    },
+  },
+}