chore: replace textDrawable library (#136)

## Types of changes

- [x] I have read the **CONTRIBUTING** document.
- [x] My code follows the code style of this project.
- [ ] I have updated the documentation accordingly.
- [ ] I have added tests to cover my changes.
- [x] All new and existing tests passed.
- [x] This is **NOT** translation related.

This closes issue #120

Removed the dependency `com.amulyakhare.textdrawable` and slightly simplified the logic required to set circular images.

Co-authored-by: davidoskky <davidoskky@yahoo.it>
Reviewed-on: https://gitea.amine-louveau.fr/Louvorg/ReaderForSelfoss-multiplatform/pulls/136
Co-authored-by: davidoskky <davidoskky@hidden.hidden>
Co-committed-by: davidoskky <davidoskky@hidden.hidden>

androidApp/build.gradle.kts

@@ -142,7 +142,6 @@ dependencies {
 
     // Material-ish things
     implementation("com.ashokvarma.android:bottom-navigation-bar:2.2.0")
-    implementation("com.amulyakhare:com.amulyakhare.textdrawable:1.0.1")
 
     // glide
     kapt("com.github.bumptech.glide:compiler:4.15.0")