fix 'go next' in articles and meeting-posts and member image url in posts

fet2020/posts/models.py

@@ -5,7 +5,6 @@ from django.urls import reverse
 from django.utils import timezone
 from django.utils.text import slugify
 from django.utils.translation import gettext_lazy as _
-from members.models import Member
 from taggit.managers import TaggableManager
 
 from .managers import (
@@ -138,10 +137,6 @@ class Post(models.Model):
     def url(self):
         return reverse('posts.show', kwargs={"id": self.slug})
 
-    @property
-    def author_member(self):
-        return Member.all_members.filter(nickname=self.author.username).first()
-
     def save(self, *args, **kwargs):
         "save the post with some defaults"
         if (self.id is None) and (not self.slug):