chore(packages): adjust names

packages/reactflow/src/base.css

@@ -0,0 +1,3 @@
+@import '../../core/src/styles/base.css';
+@import '../../controls/src/style.css';
+@import '../../minimap/src/style.css';

packages/reactflow/src/index.ts

@@ -0,0 +1,4 @@
+export * from '@react-flow/core';
+export * from '@react-flow/minimap';
+export * from '@react-flow/controls';
+export * from '@react-flow/background';

packages/reactflow/src/style.css

@@ -0,0 +1,3 @@
+@import '../../core/src/styles/style.css';
+@import '../../controls/src/style.css';
+@import '../../minimap/src/style.css';