Refine Discord and Reddit formatting rules for release notes

- Updated Discord formatting to preserve original structure and headings from source release notes.
- Added core principles to ensure no renaming, merging, or reorganizing of sections.
- Revised title formatting rules to eliminate emojis and clarify key features.
- Enhanced section rules to ensure exact copying of headings and bullet points.
- Removed PR links from all content and inline hero images.
- Streamlined user interactions for generating posts, emphasizing preservation of original content.
- Updated compression workflow to clarify behavior when content exceeds character limits.
- Adjusted Reddit formatting to align with Discord rules, ensuring consistency across platforms.

Author: hannesrudolph