doc: remove obsolete files

these must've been forgotten during the move to generated builtins.

Change-Id: I0989847abc020e9356b996f26196d2c07953f77b

doc/manual/generate-builtin-constants.nix

@@ -1,37 +0,0 @@
-let
-  inherit (builtins) concatStringsSep attrValues mapAttrs;
-  inherit (import ./utils.nix) optionalString squash;
-in
-
-builtinsInfo:
-let
-  showBuiltin =
-    name:
-    {
-      doc,
-      type,
-      impure-only,
-    }:
-    let
-      type' = optionalString (type != null) " (${type})";
-
-      impureNotice = optionalString impure-only ''
-        > **Note**
-        >
-        > Not available in [pure evaluation mode](@docroot@/command-ref/conf-file.md#conf-pure-eval).
-      '';
-    in
-    squash ''
-      <dt id="builtins-${name}">
-        <a href="#builtins-${name}"><code>${name}</code></a>${type'}
-      </dt>
-      <dd>
-
-      ${doc}
-
-      ${impureNotice}
-
-      </dd>
-    '';
-in
-concatStringsSep "\n" (attrValues (mapAttrs showBuiltin builtinsInfo))

doc/manual/generate-builtins.nix

@@ -1,35 +0,0 @@
-let
-  inherit (builtins) concatStringsSep attrValues mapAttrs;
-  inherit (import ./utils.nix) optionalString squash;
-in
-
-builtinsInfo:
-let
-  showBuiltin =
-    name:
-    {
-      doc,
-      args,
-      arity,
-      experimental-feature,
-    }:
-    let
-      experimentalNotice = optionalString (experimental-feature != null) ''
-        This function is only available if the [${experimental-feature}](@docroot@/contributing/experimental-features.md#xp-feature-${experimental-feature}) experimental feature is enabled.
-      '';
-    in
-    squash ''
-      <dt id="builtins-${name}">
-        <a href="#builtins-${name}"><code>${name} ${listArgs args}</code></a>
-      </dt>
-      <dd>
-
-      ${doc}
-
-      ${experimentalNotice}
-
-      </dd>
-    '';
-  listArgs = args: concatStringsSep " " (map (s: "<var>${s}</var>") args);
-in
-concatStringsSep "\n" (attrValues (mapAttrs showBuiltin builtinsInfo))