Remove react-shared package and fold it into website

packages/website/ts/utils/constants.ts

@@ -1,6 +1,5 @@
-import { ALink } from '@0x/react-shared';
 import { BigNumber } from '@0x/utils';
-import { Key, WebsitePaths } from 'ts/types';
+import { ALink, Key, Networks, WebsitePaths } from 'ts/types';
 
 import { SupportedDocJson } from '../types';
 
@@ -140,4 +139,19 @@ export const constants = {
         [SupportedDocJson.SolDoc]: 'solidity',
         [SupportedDocJson.TypeDoc]: 'typescript',
     } as { [supportedDocType: string]: string },
+    DOCS_SCROLL_DURATION_MS: 0,
+    SCROLL_CONTAINER_ID: 'scroll_container',
+    SCROLL_TOP_ID: 'pageScrollTop',
+    NETWORK_NAME_BY_ID: {
+        1: Networks.Mainnet,
+        3: Networks.Ropsten,
+        4: Networks.Rinkeby,
+        42: Networks.Kovan,
+    } as { [symbol: number]: string },
+    NETWORK_ID_BY_NAME: {
+        [Networks.Mainnet]: 1,
+        [Networks.Ropsten]: 3,
+        [Networks.Rinkeby]: 4,
+        [Networks.Kovan]: 42,
+    } as { [networkName: string]: number },
 };