docs: Use relative link to other README files

`master` branch was hardcoded despite working on `develop` branch

README-ZH_CN.md

@@ -1,6 +1,6 @@
 # TriliumNext Notes
 
-[English](https://github.com/TriliumNext/Notes/blob/master/README.md) | [Chinese](https://github.com/TriliumNext/Notes/blob/master/README-ZH_CN.md) | [Russian](https://github.com/TriliumNext/Notes/blob/master/README.ru.md) | [Japanese](https://github.com/TriliumNext/Notes/blob/master/README.ja.md) | [Italian](https://github.com/TriliumNext/Notes/blob/master/README.it.md) | [Spanish](https://github.com/TriliumNext/Notes/blob/master/README.es.md)
+[English](./README.md) | [Chinese](./README-ZH_CN.md) | [Russian](./README.ru.md) | [Japanese](./README.ja.md) | [Italian](./README.it.md) | [Spanish](./README.es.md)
 
 TriliumNext Notes 是一个层次化的笔记应用程序，专注于建立大型个人知识库。请参阅[屏幕截图](https://triliumnext.github.io/Docs/Wiki/screenshot-tour)以快速了解：
 

README.es.md

@@ -1,6 +1,6 @@
 # TriliumNext Notes
 
-[English](https://github.com/TriliumNext/Notes/blob/master/README.md) | [Chinese](https://github.com/TriliumNext/Notes/blob/master/README-ZH_CN.md) | [Russian](https://github.com/TriliumNext/Notes/blob/master/README.ru.md) | [Japanese](https://github.com/TriliumNext/Notes/blob/master/README.ja.md) | [Italian](https://github.com/TriliumNext/Notes/blob/master/README.it.md) | [Spanish](https://github.com/TriliumNext/Notes/blob/master/README.es.md)
+[English](./README.md) | [Chinese](./README-ZH_CN.md) | [Russian](./README.ru.md) | [Japanese](./README.ja.md) | [Italian](./README.it.md) | [Spanish](./README.es.md)
 
 TriliumNext Notes es una aplicación de toma de notas jerárquicas multi-plataforma y de código libre con un enfoque en la construcción de grandes bases de conocimiento personal.
 

README.it.md

@@ -1,6 +1,6 @@
 # TriliumNext Notes
 
-[English](https://github.com/TriliumNext/Notes/blob/master/README.md) | [Chinese](https://github.com/TriliumNext/Notes/blob/master/README-ZH_CN.md) | [Russian](https://github.com/TriliumNext/Notes/blob/master/README.ru.md) | [Japanese](https://github.com/TriliumNext/Notes/blob/master/README.ja.md) | [Italian](https://github.com/TriliumNext/Notes/blob/master/README.it.md) | [Spanish](https://github.com/TriliumNext/Notes/blob/master/README.es.md)
+[English](./README.md) | [Chinese](./README-ZH_CN.md) | [Russian](./README.ru.md) | [Japanese](./README.ja.md) | [Italian](./README.it.md) | [Spanish](./README.es.md)
 
 TriliumNext Notes è un'applicazione per appunti ad organizzazione gerarchica, studiata per la costruzione di archivi di conoscenza personali di grandi dimensioni.
 

README.ja.md

@@ -1,6 +1,6 @@
 # TriliumNext Notes
 
-[English](https://github.com/TriliumNext/Notes/blob/master/README.md) | [Chinese](https://github.com/TriliumNext/Notes/blob/master/README-ZH_CN.md) | [Russian](https://github.com/TriliumNext/Notes/blob/master/README.ru.md) | [Japanese](https://github.com/TriliumNext/Notes/blob/master/README.ja.md) | [Italian](https://github.com/TriliumNext/Notes/blob/master/README.it.md) | [Spanish](https://github.com/TriliumNext/Notes/blob/master/README.es.md)
+[English](./README.md) | [Chinese](./README-ZH_CN.md) | [Russian](./README.ru.md) | [Japanese](./README.ja.md) | [Italian](./README.it.md) | [Spanish](./README.es.md)
 
 Trilium Notes は、大規模な個人知識ベースの構築に焦点を当てた、階層型ノートアプリケーションです。概要は[スクリーンショット](https://triliumnext.github.io/Docs/Wiki/screenshot-tour)をご覧ください：
 

README.md

@@ -1,6 +1,6 @@
 # TriliumNext Notes
 
-[English](https://github.com/TriliumNext/Notes/blob/master/README.md) | [Chinese](https://github.com/TriliumNext/Notes/blob/master/README-ZH_CN.md) | [Russian](https://github.com/TriliumNext/Notes/blob/master/README.ru.md) | [Japanese](https://github.com/TriliumNext/Notes/blob/master/README.ja.md) | [Italian](https://github.com/TriliumNext/Notes/blob/master/README.it.md) | [Spanish](https://github.com/TriliumNext/Notes/blob/master/README.es.md)
+[English](./README.md) | [Chinese](./README-ZH_CN.md) | [Russian](./README.ru.md) | [Japanese](./README.ja.md) | [Italian](./README.it.md) | [Spanish](./README.es.md)
 
 TriliumNext Notes is an open-source, cross-platform hierarchical note taking application with focus on building large personal knowledge bases.
 

README.ru.md

@@ -1,6 +1,6 @@
 # TriliumNext Notes
 
-[English](https://github.com/TriliumNext/Notes/blob/master/README.md) | [Chinese](https://github.com/TriliumNext/Notes/blob/master/README-ZH_CN.md) | [Russian](https://github.com/TriliumNext/Notes/blob/master/README.ru.md) | [Japanese](https://github.com/TriliumNext/Notes/blob/master/README.ja.md) | [Italian](https://github.com/TriliumNext/Notes/blob/master/README.it.md) | [Spanish](https://github.com/TriliumNext/Notes/blob/master/README.es.md)
+[English](./README.md) | [Chinese](./README-ZH_CN.md) | [Russian](./README.ru.md) | [Japanese](./README.ja.md) | [Italian](./README.it.md) | [Spanish](./README.es.md)
 
 Trilium Notes – это приложение для заметок с иерархической структурой, ориентированное на создание больших персональных баз знаний. Для быстрого ознакомления посмотрите [скриншот-тур](https://triliumnext.github.io/Docs/Wiki/screenshot-tour):