Make a consistency in file naming, moving some of the assets to a better place

gatsby-config.js

@@ -23,7 +23,7 @@ module.exports = {
 		{
 			resolve: `gatsby-source-filesystem`,
 			options: {
-				path: `${__dirname}/content/assets`,
+				path: `${__dirname}/src/assets`,
 				name: `assets`
 			}
 		},
@@ -216,7 +216,7 @@ module.exports = {
 				background_color: `#ffffff`,
 				theme_color: `#127db3`,
 				display: `minimal-ui`,
-				icon: `content/assets/unicorn-utterances-logo-512.png`
+				icon: `src/assets/unicorn_utterances_logo_512.png`
 			}
 		},
 		`gatsby-plugin-offline`,