fix: Replaced Bookerly with Noto Serif for licensing reasons (#1736)

## Summary

Fixes #258. Bookerly is not licensed for use in CrossPoint. Switched to
Google's open Noto Serif font.

---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**NO**_

src/CrossPointSettings.h

@@ -92,7 +92,7 @@ class CrossPointSettings {
   enum SIDE_BUTTON_LAYOUT { PREV_NEXT = 0, NEXT_PREV = 1, SIDE_BUTTON_LAYOUT_COUNT };
 
   // Font family options
-  enum FONT_FAMILY { BOOKERLY = 0, NOTOSANS = 1, OPENDYSLEXIC = 2, FONT_FAMILY_COUNT };
+  enum FONT_FAMILY { NOTOSERIF = 0, NOTOSANS = 1, OPENDYSLEXIC = 2, FONT_FAMILY_COUNT };
   // Font size options
   enum FONT_SIZE { SMALL = 0, MEDIUM = 1, LARGE = 2, EXTRA_LARGE = 3, FONT_SIZE_COUNT };
   enum LINE_COMPRESSION { TIGHT = 0, NORMAL = 1, WIDE = 2, LINE_COMPRESSION_COUNT };
@@ -169,7 +169,7 @@ class CrossPointSettings {
   uint8_t frontButtonLeft = FRONT_HW_LEFT;
   uint8_t frontButtonRight = FRONT_HW_RIGHT;
   // Reader font settings
-  uint8_t fontFamily = BOOKERLY;
+  uint8_t fontFamily = NOTOSERIF;
   uint8_t fontSize = MEDIUM;
   uint8_t lineSpacing = NORMAL;
   uint8_t paragraphAlignment = JUSTIFIED;