Keep screen on and update docs (#179)

* Extract recipe screen components

* Keep screen on while recipe is shown

* Update screenshots

* Add release note

app/src/main/java/gq/kirmanak/mealient/extensions/ContextExtensions.kt

@@ -0,0 +1,14 @@
+package gq.kirmanak.mealient.extensions
+
+import android.app.Activity
+import android.content.Context
+import android.content.ContextWrapper
+
+fun Context.findActivity(): Activity? {
+    var context = this
+    while (context is ContextWrapper) {
+        if (context is Activity) return context
+        context = context.baseContext
+    }
+    return null
+}