Cleanup hero images and titles on older posts.

Signed-off-by: Andy Piper <andypiper@users.noreply.github.com>

Author: andypiper

content/posts/2024-08-09_trunk_and_tidbits-july_2024/index.md

@@ -18,9 +18,6 @@ resources:
   src: hero.png
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-# Trunk & Tidbits, July 2024
-
 Hey, friends - here is another instalment in our engineering updates series. This is what has been happening in the code lately.
 
 ## Team Updates

content/posts/2024-09-09_trunk_and_tidbits-august_2024/hero.png

@@ -18,8 +18,6 @@ resources:
   src: hero.png
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-# Trunk & Tidbits, August 2024
-
 It was a big month for the Mastodon team, with a lot of work going into getting the first beta release of version 4.3 ready - but that's not all that we've worked on. Here is our monthly update on what we've been up to.
 
 ## Releases

content/posts/2024-09-09_trunk_and_tidbits-august_2024/index.md

@@ -18,8 +18,6 @@ resources:
 
 ---
 
-# Trunk & Tidbits, September 2024
-
 Hello, friends! It’s time for another installment of our engineering updates series. Here’s what’s been happening in the code this past month.
 
 ## Releases

content/posts/2024-10-09_trunk_and_tidbits-september_2024/hero.png

@@ -18,8 +18,6 @@ resources:
 draft: false
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-# Trunk & Tidbits, October 2024
-
 Welcome back to our monthly engineering series. In October, our long-anticipated plushies got out into the wild (mostly in Europe, for now), and we were busy tuning the code and planning what's next.
 
 This is also a larger entry in our blog series, for updates from around our community.

content/posts/2024-10-09_trunk_and_tidbits-september_2024/index.md

@@ -17,8 +17,6 @@ resources:
   src: hero.png
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-# Trunk & Tidbits, November 2024
-
 Hi everyone! We're back with our monthly engineering update, looking back at a busy November.
 
 ## General news