Docs: Add troubleshooting chapter

I would guess that the Key too long error happens quite frequently
Icinga · Apr 17, 2019 · 5b7cd06 · 5b7cd06
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+# Troubleshooting <a id="troubleshooting"></a>
+
+## MySQL Import: Key too long <a id="troubleshooting-mysql-schema-key"></a>
+
+MySQL schema import fails like this:
+
+```
+ERROR 1071 (42000) at line 1: Specified key was too long; max key length is 767 bytes
+```
+
+Ensure to follow the [database setup](02-Installation.md#installation-database-setup)
+and enable `innodb_large_prefix` in your database server configuration.