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**_

.skills/SKILL.md

@@ -405,7 +405,7 @@ void onExit()   { /* free: vTaskDelete, free buffer, close files */ Activity::on
 **Source**: [src/main.cpp:40-115](../src/main.cpp)
 
 **All fonts are loaded as global static objects** at firmware startup:
-- Bookerly: 12, 14, 16, 18pt (4 styles each: regular, bold, italic, bold-italic)
+- Noto Serif: 12, 14, 16, 18pt (4 styles each: regular, bold, italic, bold-italic)
 - Noto Sans: 12, 14, 16, 18pt (4 styles each)
 - OpenDyslexic: 8, 10, 12, 14pt (4 styles each)
 - Ubuntu UI fonts: 10, 12pt (2 styles)

USER_GUIDE.md

@@ -155,7 +155,7 @@ The Settings screen allows you to configure the device's behavior. There are a f
 
 #### 3.6.2 Reader
 - **Reader Font Family**: Choose the font used for reading:
-  - "Bookerly" (default) - Amazon's reading font
+  - "Noto Serif" (default) - Google's serif font
   - "Noto Sans" - Google's sans-serif font
   - "Open Dyslexic" - Font designed for readers with dyslexia
 - **Reader Font Size**: Adjust the text size for reading; options are "Small", "Medium" (default), "Large", or "X Large".

lib/EpdFont/builtinFonts/all.h

@@ -1,21 +1,21 @@
 #pragma once
 
-#include <builtinFonts/bookerly_12_bold.h>
-#include <builtinFonts/bookerly_12_bolditalic.h>
-#include <builtinFonts/bookerly_12_italic.h>
-#include <builtinFonts/bookerly_12_regular.h>
-#include <builtinFonts/bookerly_14_bold.h>
-#include <builtinFonts/bookerly_14_bolditalic.h>
-#include <builtinFonts/bookerly_14_italic.h>
-#include <builtinFonts/bookerly_14_regular.h>
-#include <builtinFonts/bookerly_16_bold.h>
-#include <builtinFonts/bookerly_16_bolditalic.h>
-#include <builtinFonts/bookerly_16_italic.h>
-#include <builtinFonts/bookerly_16_regular.h>
-#include <builtinFonts/bookerly_18_bold.h>
-#include <builtinFonts/bookerly_18_bolditalic.h>
-#include <builtinFonts/bookerly_18_italic.h>
-#include <builtinFonts/bookerly_18_regular.h>
+#include <builtinFonts/notoserif_12_bold.h>
+#include <builtinFonts/notoserif_12_bolditalic.h>
+#include <builtinFonts/notoserif_12_italic.h>
+#include <builtinFonts/notoserif_12_regular.h>
+#include <builtinFonts/notoserif_14_bold.h>
+#include <builtinFonts/notoserif_14_bolditalic.h>
+#include <builtinFonts/notoserif_14_italic.h>
+#include <builtinFonts/notoserif_14_regular.h>
+#include <builtinFonts/notoserif_16_bold.h>
+#include <builtinFonts/notoserif_16_bolditalic.h>
+#include <builtinFonts/notoserif_16_italic.h>
+#include <builtinFonts/notoserif_16_regular.h>
+#include <builtinFonts/notoserif_18_bold.h>
+#include <builtinFonts/notoserif_18_bolditalic.h>
+#include <builtinFonts/notoserif_18_italic.h>
+#include <builtinFonts/notoserif_18_regular.h>
 #include <builtinFonts/notosans_8_regular.h>
 #include <builtinFonts/notosans_12_bold.h>
 #include <builtinFonts/notosans_12_bolditalic.h>