discord: use link to post instead of direct image

suchwow/discord.py

@@ -13,7 +13,7 @@ def post_discord_webhook(post):
     try:
         wallet = wownero.Wallet()
         post_wow_address = wallet.get_address(account=post.account_index)
-        content = f"{choice(intro)} {choice(insults)}, new SuchWow post #{post.id} by {post.submitter} is up! Tip WOW to `{post_wow_address}` to show support! {url_for('post.uploaded_file', filename=post.image_name, _external=True)}"
+        content = f"{choice(intro)} {choice(insults)}, new SuchWow post #{post.id} by {post.submitter} is up! {url_for('post.read', id=post.id, _external=True)}"
         msg = {"content": content}
         discord_webhook_url = config.DISCORD_URL
         r = requests.post(discord_webhook_url, data=msg)