Improve CSS of https://airflow.apache.org/announcements/

[ryw]

line spacing isn't optimized, feels jumbly.

[mik-laj]

Does this problem occur on the documentation page? Can we use the same styles?
https://airflow.apache.org/docs/

[ryw]

docs styling looks nicer for sure - I'd say we give it a try

[ryanahamilton]

It just needs what should be easy adjustments. E.g. the titles shouldn't be H1 tags and need top margin added. I need to take another try at getting the web site running locally—it wasn't very straightforward last time I attempted.

[gdivya6028]

hi @mik-laj , i would like to work on this issue. pls assign it to my name.