imenu-list layer
This layer uses imenu-list to show the current buffer's index in a side bar.
This is similar to `SPC j i` but displayed in a persistent sidebar instead of a completion buffer.

To use this configuration layer, add it to your ~/.spacemacs. You will need to
add imenu-list to the existing dotspacemacs-configuration-layers list in
this file.
| Key Binding | Description |
|---|---|
SPC b i |
toggle imenu-list window |
| Key Binding | Description |
|---|---|
q |
quit imenu-list window |
RET |
go to current entry |
d |
display current entry, keep focus on imenu-list window |
f |
fold/unfold current section |