Update copyright and license information to only link to one place.

activity_browser/static/startscreen/welcome.html

@@ -97,20 +97,8 @@ <h2>Contributing</h2>
 page on contributing </a>for more detailed instructions.<br>
 
 <h2>Copyright and License</h2>
-Copyright (c) 2016-2023, Bernhard Steubing (Leiden University)<br>
+For copyright information please see the copyright on <a href="https://github.com/LCA-ActivityBrowser/activity-browser/tree/master#copyright">this page</a>.<br><br>
 
 <h2>Copyright and License</h2>
-This program is free software: you can redistribute it and/or
-modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be
-useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public
-License
-along with this program. If not, see <a href="http://www.gnu.org/licenses/" rel="nofollow">http://www.gnu.org/licenses/</a>.
+For license information please see the copyright on <a href="https://github.com/LCA-ActivityBrowser/activity-browser/blob/master/LICENSE.txt">this page</a>.<br><br>
 </body></html>

activity_browser/ui/menu_bar.py

@@ -120,15 +120,8 @@ def about(self):
 Activity Browser - a graphical interface for Brightway2.<br><br>
 Application version: <b>{}</b><br><br>
 All development happens on <a href="https://github.com/LCA-ActivityBrowser/activity-browser">github</a>.<br><br>
-Main developers:<br>
-- Bernhard Steubing (CML Leiden University)<br>
-- Jonathan Kidner (CML Leiden University)<br><br>
-For copyright information please see the copyright on <a href="https://github.com/LCA-ActivityBrowser/activity-browser>github</a>.<br><br>
-<br>
-LICENSE:<br>
-This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.<br><br>
-This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.<br><br>
-You should have received a copy of the GNU Lesser General Public License along with this program.  If not, see <a href="http://www.gnu.org/licenses/">http://www.gnu.org/licenses/</a>.
+For copyright information please see the copyright on <a href="https://github.com/LCA-ActivityBrowser/activity-browser/tree/master#copyright">this page</a>.<br><br>
+For license information please see the copyright on <a href="https://github.com/LCA-ActivityBrowser/activity-browser/blob/master/LICENSE.txt">this page</a>.<br><br>
 """
         msgBox = QtWidgets.QMessageBox(parent=self.window)
         msgBox.setWindowTitle('About the Activity Browser')