Clarify sqlite database placement

Signed-off-by: Nils VAN ZUIJLEN <nils.van-zuijlen@mailo.com>

README.md

@@ -19,7 +19,7 @@ Or do `pip install --user pipenv`
 
 ## Database
 
-By default, it uses a sqlite database located at `/db.sqlite3` which is ignored by git.
+By default, it uses a sqlite database located in `db.sqlite3` at the repository root and is ignored by git.
 
 This is not the production setup, so some DB checks may not be done.
 As the CI runs with the same engine as production (PostgreSQL), this is not critical if