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Add an alias for adding files in the mercurial plugin.

In the home directory there is a .terraform folder for modules but it is most likely not
an actual directory of terraform scripts. Therefore, this patch disables checking for workspace in the home directory.

+ changed keypresses to use the <kbd> tag
+ added "rebinding keys" section
- removed line break on description
- removed line break on "rebinding keys"

The flag '-h' isn't universal across implementation. According to FreeBSD man page for ln you can use 'n'.