Light refactor

[chrieke]

No logic changes, makes main script more readable & separates creating the content to display & displaying it in streamlit (Relevant for readability, display formatting changes, (tests)).

[jrieke]

Looks good. What about merging content.py and tweet_templates.py into one file (they basically do the same stuff/rely on each other anyway)?

E.g. name this file templates.py, then you can do (in the main file) tweet = templates.construct_tweet(stats), and everything for this function is in templates. Or we could even rename the functions to make it a bit more Pythonic, e.g. tweet = templates.tweet(stats) and templates.tweet_button(tweet).