group minor/other versions into a collapsable menu

[lazarusA]

With the arrival of v0.2, now we can see something like:

(We should group them, something like

dev
stable
v0.2 # collapse
   - v0.2.2
   - v0.2.1
v0.1 # collapse
  - v0.1.2
  - v0.1.1
  - v0.0.2
  - v0.0.1

[asinghvi17]

Expand on hover would be good, and they should also be clickable as is.