Add visualisation of posting frequency
As part of #534, I want to make it easier to visualise how often I post content, of all content types. For now, look at it in terms of: - per hour - per day - per day of the week - per month And will see if there are any other interesting pieces of data I want to present in the future. This requires generating the actual counts of data, which I can do using a custom output format's template, and then render it using Chart.JS. Plus, add an announcement post. Closes #534.
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