EN, CZ : Authoring Guide link added to tree

Author: VitSimon

cs/tree.lst

@@ -7,4 +7,5 @@
 🚀 Stáhnout|Balíček pro offline použití||=latestApp
 🔗 GitHub|GitHub repozitář||https://github.com/HelpViewer/HelpViewer
 📖 Uživatelská příručka|Uživatelská příručka||?d=hlp-user/Help-__.zip
+📖 Dokumentace pro autory|Dokumentace pro autory||?d=https%3A%2F%2Fgithub.51.al%2FHelpViewer%2FhelpAuthorsGuide%2Fmaster%2F__%2F
 💬 Uživatelská skupina|Uživatelská skupina Discord||https://discord.gg/J2SjcmqHSZ

en/tree.lst

@@ -7,4 +7,5 @@
 🚀 Deployment package|Deployment package||=latestApp
 🔗 GitHub|GitHub repository||https://github.com/HelpViewer/HelpViewer
 📖 User quick guide|User quick guide||?d=hlp-user/Help-__.zip
+📖 Authoring Guide|Authoring Guide||?d=https%3A%2F%2Fgithub.51.al%2FHelpViewer%2FhelpAuthorsGuide%2Fmaster%2F__%2F
 💬 User group Discord|User group Discord||https://discord.gg/J2SjcmqHSZ