Add options for a disclaimer, fix html code and remove deprecations (#50)

* Add options for a disclaimer, fix html code and remove deprecations

* Update READMEs

* Minor improvement to portal admin [skip ci]

ram/portal/migrations/0019_siteconfiguration_disclaimer.py

@@ -0,0 +1,19 @@
+# Generated by Django 5.1.4 on 2025-01-30 16:39
+
+import tinymce.models
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("portal", "0018_siteconfiguration_currency"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="siteconfiguration",
+            name="disclaimer",
+            field=tinymce.models.HTMLField(blank=True),
+        ),
+    ]