Stream inflated EPUB HTMLs down to disk instead of inflating in memory (#4)

* Downgrade miniz for stability

* Stream HTML from ZIP down to disk instead of loading all in mem

src/screens/EpubReaderScreen.cpp

@@ -135,6 +135,7 @@ void EpubReaderScreen::displayTaskLoop() {
   }
 }
 
+// TODO: Failure handling
 void EpubReaderScreen::renderPage() {
   if (!epub) {
     return;