nvim: stop using nix for nvim

I just wanna work, I don't wanna nix

.config/nvim/lua/utils.lua

@@ -0,0 +1,47 @@
+M = {}
+
+M.Map = function(tbl, f)
+    local t = {}
+    for k, v in pairs(tbl) do
+        t[k] = f(v)
+    end
+    return t
+end
+
+M.Foreach = function(tbl, f)
+    for k, v in pairs(tbl) do
+        f(k, v)
+    end
+end
+
+M.Contains = function(tbl, elem)
+    for _, v in pairs(tbl) do
+        if v == elem then
+            return true
+        end
+    end
+    return false
+end
+
+M.Filter = function(tbl, pred)
+    local t = {}
+    for k, v in pairs(tbl) do
+        if pred(v) then
+            t[k] = v
+        end
+    end
+    return t
+end
+
+M.Concat = function(tbl1, tbl2)
+    local t = {}
+    for k, v in pairs(tbl1) do
+        t[k] = v
+    end
+    for k, v in pairs(tbl2) do
+        t[k] = v
+    end
+    return t
+end
+
+return M