webpack-dev-server: Do not reload page when database file is modified

webpack-dev-server watches static files and will reload application in
the browser when one of them is modified.

However, we need to ignore sqlite3 database files used in development
mode as any HTTP request that modifies the database will trigger an
unexpected page reload.

assets/config/webpack.config.development.js

@@ -115,7 +115,7 @@ module.exports = {
     static: {
       directory: path.resolve('./'),
       watch: {
-        ignored: /(node_modules|.tox|.mypy)/
+        ignored: /(node_modules|.tox|.mypy|.*.sqlite3)/
       }
     },
     // we do not use hot reloading here (as a framework like React needs to be used in order to fully benefit from that feature)