add option to set base path

README.md

@@ -34,4 +34,5 @@ Configurations can be done with env variables
 | `HOST`              | Host the server should listen on                                                                                                                    |
 | `PORT`              | Port the server should listen on                                                                                                                    |
 | `DATABASE_URI`      | URI to the database as a connection string. Supported databases are [sqlite](https://www.sqlite.org/index.html) and [mariadb](https://mariadb.org/) |
+| `PUBLIC_BASE_PATH`  | If running the website on a sub-path, set this variable to the path so that assets etc. can find the correct location                               |
 | `PUBLIC_START_DATE` | The start date when the event starts                                                                                                                |