Book Marx: Properly format bookmarks.

Change-Id: Idd6f2c4622d4b1a16c74b2d3af02e637625732fc
diff --git a/build.gradle b/build.gradle
index d7c4fea..5643d46 100644
--- a/build.gradle
+++ b/build.gradle
@@ -75,6 +75,8 @@
 
     implementation 'org.jsoup:jsoup:1.12.1'
 
+    implementation "com.vladsch.flexmark:flexmark-all"
+
     constraints {
         implementation "com.vladmihalcea:hibernate-types-52:${hibernateTypesVersion}"
         implementation "org.mapstruct:mapstruct:${mapstructVersion}"
@@ -83,6 +85,7 @@
         implementation "jakarta.security.jacc:jakarta.security.jacc-api:${jakartaJaccVersion}"
         implementation "net.java.dev.jna:jna:${jnaVersion}"
         implementation "org.bitbucket.b_c:jose4j:${jose4jVersion}"
+        implementation "com.vladsch.flexmark:flexmark-all:${flexmarkVersion}"
     }
 }