add copyright and license tags to CSS and templates

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

incorporealcms/static/css/base.css

@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
 html {
     font-family: sans-serif;
     padding: 0;

incorporealcms/static/css/dark.css

@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
 /* common styling via the base.css, used in light and dark */
 @import '/static/css/base.css';
 

incorporealcms/static/css/light.css

@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
 /* common styling via the base.css, used in light and dark */
 @import '/static/css/base.css';
 

incorporealcms/static/css/plain.css

@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
 /* specify almost no styling, just fix some image and nav rendering */
 div.header {
     display: flex;