Limit post max length to 2k instead of 10k

10k is a little too long for this style of social media.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/models.py

@@ -88,7 +88,7 @@ class Post(models.Model):
     # User's supplied subject for this post
     subject = models.CharField(max_length=255, null=True, blank=True)
     # Text of this post
-    text = models.TextField(max_length=10000, null=False, blank=True)
+    text = models.TextField(max_length=2000, null=False, blank=True)
     # The IP address of the user that made this post
     ip = models.GenericIPAddressField()
     # Capcode