Ability to clear marked as read articles from memory

[KorneevVitaly]

1. Environment

• Device: []
• OS: [Android 12.1]
• APP: [0.7.2]

2. Describe the feature request

As title says: add in options feature to clean from memory marked as read articles. As clear cache for example or how it saves them in app.

[IHateTheProgrammingClass]

This would be great. It allows freeing up space without deleting too many articles.

[Ashinch]

#185