Nefelibata

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This is a major refactor, improving performance and adding support for Gemini.

- Support for building a Gemini capsule
- Many Gemini announcers were added (Antenna, CAPCOM, Geminispace)
- Some announcers were not migrated (Twitter, WT.Social, Medium, 50/90, FAWM)
- Some publishers were not migrated (NeoCities, IPFS)
- Commands (build, publish) now run in parallel and more efficiently
- Support for multiple announcers of the same type
- Support for per-build announcers and publishers

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- Allow defining mini-templates for different post types
- New assistant for fetching current weather

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- Fix for reading time assistant

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- New assistant that displays approximate reading time on posts

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- Do not load non-configured announcers

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- Add missing entries for FTP publisher and 50/90 announcer in skeleton YAML
- Fix Neocities publisher so it doesn't try to POST without modified files