fix: do not hardcode siteConfig path (#1150)

* Fix broken build

Do not hardcode path in require to siteConfig

* Just require instead of loadConfig

* Actually use loadConfig

I think the test may be wrong too.

* refactor & nits

* jest mock to fix test

* fix test

v1/lib/server/blog.js

@@ -4,12 +4,16 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  */
+const CWD = process.cwd();
 const React = require('react');
 const path = require('path');
 const fs = require('fs-extra');
 const metadataUtils = require('./metadataUtils');
 const {replaceAssetsLink} = require('./utils.js');
 const {renderToStaticMarkupWithDoctype} = require('./renderUtils');
+const loadConfig = require('./config');
+
+const siteConfig = loadConfig(`${CWD}/siteConfig.js`);
 
 function urlToSource(url) {
   if (!url || typeof url !== 'string') {
@@ -59,7 +63,10 @@ function getMetadata(file) {
   const metadata = Object.assign(
     {
       path: fileToUrl(file),
-      content: replaceAssetsLink(result.rawContent, 'blog'),
+      content: replaceAssetsLink(
+        result.rawContent,
+        `${siteConfig.baseUrl}blog`,
+      ),
     },
     result.metadata,
   );