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`lstheme` command used to list only the themes listed in `$ZSH/themes/` directory. This commit adds themes in `$ZSH_CUSTOM/themes/` also to the theme listings.

These themes used an adhoc substitution of $HOME for tilde
in $PWD, but it's better to use '%~' and is less error prone.

See #7160

add new option update and add all the options for ng update

* Create gitfast readme

* Add list of gitfast aliases

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"