Thanks a lot, Martin. I’m a total coding idiot, but this transition worked very smoothly. Getting my archive files from Twitter was more of a hassle than setting up that new repository/page. (Okay, I already had a GitHub account…)
Contrary to the Google Drive hosting (which broke a bit over the years), now the profile pic shows up correctly on every tweet. And with Alan’s tip I was even able to adjust the sidebar. Thanks again, guys!