chore: add AGPL3-or-later license

This CL adds the AGPL3-or-later license for all public code.

It also adds some configuration so we can use headroom to automatically
generate the license headers.

GitOrigin-RevId: 634827ab248c207e6841dbad29f59aeadcbef541
diff --git a/src/css/calendar.css b/src/css/calendar.css
index a6d979b..7e3e806 100644
--- a/src/css/calendar.css
+++ b/src/css/calendar.css
@@ -1,3 +1,21 @@
+/*
+ * hores
+ * Copyright (c) 2023 Adrià Vilanova Martínez
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this program.
+ * If not, see http://www.gnu.org/licenses/.
+ */
 .calendar {
   margin: 10px auto 40px auto;
   border-collapse: collapse;
diff --git a/src/css/dashboard.css b/src/css/dashboard.css
index 7bec14f..805e57b 100644
--- a/src/css/dashboard.css
+++ b/src/css/dashboard.css
@@ -1,3 +1,21 @@
+/*
+ * hores
+ * Copyright (c) 2023 Adrià Vilanova Martínez
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this program.
+ * If not, see http://www.gnu.org/licenses/.
+ */
 :root {
   --material-green: rgb(76,175,80);
 }
diff --git a/src/css/incidents.css b/src/css/incidents.css
index 2104748..a68c7dd 100644
--- a/src/css/incidents.css
+++ b/src/css/incidents.css
@@ -1,3 +1,21 @@
+/*
+ * hores
+ * Copyright (c) 2023 Adrià Vilanova Martínez
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this program.
+ * If not, see http://www.gnu.org/licenses/.
+ */
 .incidents-wrapper {
   display: inline-block;
 }
diff --git a/src/css/index.css b/src/css/index.css
index e6b4c36..02744a3 100644
--- a/src/css/index.css
+++ b/src/css/index.css
@@ -1,3 +1,21 @@
+/*
+ * hores
+ * Copyright (c) 2023 Adrià Vilanova Martínez
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this program.
+ * If not, see http://www.gnu.org/licenses/.
+ */
 .login {
   display: block;
   max-width: 400px;
diff --git a/src/css/schedule.css b/src/css/schedule.css
index d655252..0535761 100644
--- a/src/css/schedule.css
+++ b/src/css/schedule.css
@@ -1,3 +1,21 @@
+/*
+ * hores
+ * Copyright (c) 2023 Adrià Vilanova Martínez
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this program.
+ * If not, see http://www.gnu.org/licenses/.
+ */
 .schedule {
   display: inline-flex;
   flex: none;