Fix broken links, add more examples and a new section

readthedocs/extra/examples/projects-using-telethon.rst

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+=======================
+Projects using Telethon
+=======================
+
+This page lists some real world examples showcasing what can be built with
+the library.
+
+.. note::
+
+    Do you have a project that uses the library or know of any that's not
+    listed here? Feel free to leave a comment at
+    `issue 744 <https://github.com/LonamiWebs/Telethon/issues/744>`_
+    so it can be included in the next revision of the documentation!
+
+
+telegram-export
+***************
+
+`Link <https://github.com/expectocode/telegram-export>`_ /
+`Author's website <https://github.com/expectocode>`_
+
+A tool to download Telegram data (users, chats, messages, and media)
+into a database (and display the saved data).
+
+
+mautrix-telegram
+****************
+
+`Link <https://github.com/tulir/mautrix-telegram>`_ /
+`Author's website <https://maunium.net/>`_
+
+A Matrix-Telegram hybrid puppeting/relaybot bridge.
+
+
+TelegramTUI
+***********
+
+`Link <https://github.com/bad-day/TelegramTUI>`_ /
+`Author's website <https://github.com/bad-day>`_
+
+A Telegram client on your terminal.