Read/write css file from app settings. Changed order of operations at app startup. Added nano to Dockerfile

utils/File.js

@@ -0,0 +1,25 @@
+const fs = require('fs');
+
+class File {
+  constructor(path) {
+    this.path = path;
+    this.content = '';
+  }
+
+  read() {
+    try {
+      const content = fs.readFileSync(this.path, { encoding: 'utf-8' });
+      this.content = content;
+      return this.content;
+    } catch (err) {
+      return err.message;
+    }
+  }
+
+  write(data) {
+    this.content = data;
+    fs.writeFileSync(this.path, this.content);
+  }
+}
+
+module.exports = File;