Open help links in new tabs by default

Every now and then, people click the links while creating or editing a
trip, only to lose their progress. I should better solve that problem
(and the issue of accidentally closing a tab/window) by instead
prompting the user with an "unsaved changes" modal.

However, I looked into doing that before, and I *think* I decided
against it because the trip creation form is still using super legacy
AngularJS forms.

For now, we can at least just force a new tab/window. I don't love this,
and it's somewhat against W3C guidelines (though this is a carve-out for
links on a form page):
https://www.w3.org/TR/WCAG20-TECHS/G200.html

ws/migrations/0007_target_blank_help_links.py

@@ -0,0 +1,36 @@
+# Generated by Django 4.2.17 on 2025-01-06 03:58
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("ws", "0006_add_ws_application_question"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="trip",
+            name="description",
+            field=models.TextField(
+                help_text='<a href="https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet" target="_blank">Markdown</a> supported! Please use HTTPS images sparingly, and only if properly licensed.'
+            ),
+        ),
+        migrations.AlterField(
+            model_name="trip",
+            name="winter_terrain_level",
+            field=models.CharField(
+                blank=True,
+                choices=[
+                    ("A", "A: <1 hour to intensive care, below treeline"),
+                    ("B", "B: >1 hour to intensive care, below treeline"),
+                    ("C", "C: above treeline"),
+                ],
+                db_index=True,
+                help_text='Trip leaders must meet <a href="/help/participants/ws_ratings/" target="_blank">requirements for terrain & activity ratings</a>.',
+                max_length=1,
+                null=True,
+                verbose_name="Terrain level",
+            ),
+        ),
+    ]

ws/models.py

@@ -1081,7 +1081,7 @@ class Trip(models.Model):
     name = models.CharField(max_length=127)
     description = models.TextField(
         help_text=mark_safe(  # noqa: S308
-            '<a href="https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet">'
+            '<a href="https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet" target="_blank">'
             "Markdown</a> supported! "
             "Please use HTTPS images sparingly, and only if properly licensed."
         )
@@ -1111,7 +1111,7 @@ class Trip(models.Model):
             ("C", "C: above treeline"),
         ],
         help_text=mark_safe(  # noqa: S308
-            'Trip leaders must meet <a href="/help/participants/ws_ratings/">requirements for terrain & activity ratings</a>.',
+            'Trip leaders must meet <a href="/help/participants/ws_ratings/" target="_blank">requirements for terrain & activity ratings</a>.',
         ),
         db_index=True,
     )