Adds "Now" page functionality

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

makefile

@@ -98,3 +98,6 @@ precommit: ## Run pre-commit hooks
 
 micro: ## Run microblog script
 	@poetry run python3 make-post.py micro
+
+now: ## Run now script
+	@poetry run python3 make-post.py now