chore: rewrite devshell, remove checks

nix/devshell.nix

@@ -1,27 +1,21 @@
-{ inputs, ... }:
 {
   perSystem =
     {
+      craneLib,
       self',
       lib,
       pkgs,
       ...
     }:
-    let
-      uwulib = inputs.self.uwulib.init pkgs;
-      rocksdbAllFeatures = self'.packages.rocksdb.override {
-        enableJemalloc = true;
-      };
-    in
     {
       # basic nix shell containing all things necessary to build continuwuity in all flavors manually (on x86_64-linux)
-      devShells.default = uwulib.build.craneLib.devShell {
+      devShells.default = craneLib.devShell {
         packages = [
           pkgs.nodejs
           pkgs.pkg-config
           pkgs.liburing
           pkgs.rust-jemalloc-sys-unprefixed
-          rocksdbAllFeatures
+          self'.packages.rocksdb
         ];
         env.LIBCLANG_PATH = lib.makeLibraryPath [ pkgs.llvmPackages.libclang.lib ];
       };