Implements a "Now" page to share current activities, inspired by nownownow.com.
- Introduces a new content type "now" with corresponding layouts and archetype.
- Adds a "Now" entry to the main menu.
- Creates a script to easily generate new "now" entries.
- Updates the colophon page with information about the "now" page.
- Deletes weeknote config as it isn't in use anymore
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