activity feed css needs tweaked to fill screen

[owocki]

https://bits.owocki.com/E0uzlmkz

can we widen the activity feed to fill the same amount of width as container

[apbendi]

done with https://github.com/gitcoinco/web/pull/6832/commits/bcbd18777d94d3f030b755ae73888c35ebd3c8fc