6: Enhance demo application (#9)

* 6: Use data model instead of String. Remove databinding.

* 6: Use online lib dependency

* 6: Remove CircleCI

app/build.gradle

@@ -23,9 +23,6 @@ android {
     buildFeatures {
         viewBinding true
     }
-    dataBinding {
-        enabled = true
-    }
 }
 
 dependencies {
@@ -34,8 +31,7 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.5.1'
     implementation 'androidx.core:core-ktx:1.9.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
-
-    implementation project(path: ':expandable-recyclerview')
+    implementation 'com.github.adriankuta:expandable-recyclerView:2.1.0'
 
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.4'