This make `SPC h SPC` as default binding for accessing `helm-spacemacs`,
by either A) changing all the documentation; and B) adding a deprecation
message for `SPC f e h`.
The deprecation use a warning, because if a message is used it's hidden
directly when the helm buffer is shown, making it nearly unnoticeable
for the user.
1. Fix broken links.
2. Make spacing consistent with other documentation.
3. Use a better function example. The previous one did not work for some
common use cases.
4. Update and add some screenshots for use in the file.
As this includes 4 levels of headings, the tag that needs to be used is
:TOC@4:. Now every time one saves this file, the TOC is automatically
generated. There is an interesting feature from toc-org that enables
users to use org links or GitHub enabled
[links](https://github.com/snosov1/toc-org#use)
we should discuss how to use it because on one hand, having org links
makes it easier to read in emacs, while having GitHub links makes it
easier to read online.
- Use `~` marker to represent key bindings. The `~` and `=` markers are
equivalent in Emacs: `=` uses `org-verbatim verbatim` faces, while `~`
uses `org-code verbatim)`, but both `org-verbatim` and `org-code` is
inherited from `shadow` face. So we can use `~` marker for this purpose.
`~` marker is also displayed properly on Github, since it's part of
standard Emacs, so no web functionality is broken.
- Add org-kbd face for displaying key bindings.
- Update CHANGELOG.org: use the proper `~` marker for key bindings.
- Update VIMUSERS.org: use the proper `~` marker for key bindings.
