**Added:**

* Added a general customization FAQ page to the docs to collect various
  tips/tricks/fixes for common issues/requests

**Changed:**

* Removed ``add_to_shell`` doc section from *nix install pages and instead
  relocated it to the general customization page
* Moved a few *nix customization tips from the linux install page to the general
  customization page

**Deprecated:** None

**Removed:** None

**Fixed:** None

**Security:** None