Apply example_ynh

doc/DISCLAIMER.md

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+* Any known limitations, constrains or stuff not working, such as (but not limited to):
+    * **Wiki.js** requires a dedicated **root domain**, e.g. wikijs.domain.tld
+    * LDAP is implemented, root will receive an e-mail at the end of the installation or the upgrade with the info on how to configure LDAP.
+    * No HTTP auth for now, but planned for the future.
+    * the app requires an important amount of RAM / disk / .. to install or to work properly
+    * etc...
+
+* Other infos that people should be aware of, such as:
+    * any specific step to perform after installing (such as manually finishing the install, specific admin credentials, ...)
+    * how to configure / administrate the application if it ain't obvious
+    * upgrade process / specificities / things to be aware of ?
+    * security considerations ?