Enabled some dev flags + add public dir to gitignore

Author: Andrei Jiroh Eugenio Halili

.gitignore

@@ -104,7 +104,7 @@ dist/
 .cache/
 # Comment in the public line in if your project uses Gatsby and not Next.js
 # https://nextjs.org/blog/next-9-1#public-directory-support
-#public
+public
 
 # vuepress build output
 .vuepress/dist

gatsby-config.js

@@ -1,4 +1,11 @@
 module.exports = {
+  flags: {
+    // Only enable experimental flags at your own risk.
+    DEV_SSR: true,
+    PRESERVE_WEBPACK_CACHE: true,
+    PRESERVE_FILE_DOWNLOAD_CACHE: true,
+    FAST_DEV: true,
+  },
   siteMetadata: {
     siteTitle: `Code Server Boilerplates Docs | The Pins Team`,
     defaultTitle: `Code Server Boilerplates Docs | The Pins Team`,