I use Advanced Tables as well. Anyone know if the new table tools in 1.5.0 replace all the features of Advanced Tables? If not, can Advanced Tables still be used?

Ideally you would create a new note with the content of the article. You should then go through and put double brackets around any important terms or concepts. Click on each of those new links so a new note is created for each term or concept. If you do this for multiple articles, each new note you create will begin to have a list of backlinks to each article that mentions that term/concept, acting like an index. You can even add your own thoughts about that term/concept on the note, expanding it's usefulness. I find this method of interlinking files to be very useful, resulting in a 'living index' of your vault.

You can configure Obsidian to look the same way your example is laid out, the side bars can be open or closed, and rearranged in many ways.