Update README

[misialq]

The current README is a little bit out-of-date - let's update it. Below are some things I noticed but please add anything what may still be missing:

Tasks

Preview Give feedback

1. the indentation in the first code block is a bit off (check https://github.com/bokulich-lab/q2-fondue to see what it should look like)
2. the table is missing links - maybe we could actually add another column stating which method from RGI is being used by those actions?
3. Make sure installation instructions work q2-amr#14
   +0
   
4. Re-format the code using black q2-amr#15
   +0
   
5. Test whether the RGI fix is still needed #16
   +0