Allow read-only browsing by guests

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Checklist

• [ X ] I have checked that this feature is not already requested
• [ X ] I have checked that this feature does not already exist in the project

Is your feature request related to a problem? Please describe.
To browse cocktails and other items in the bar requires a user account. This isn't great when guests are visiting and you want them to be able to browse the bar without maintaining a separate menu. For example, members of the household would have accounts because they already manage the bar, but visitors (family, friends, etc.) shouldn't need one. This isn't the same as a menu though which must be curated and maintained: rather, people should just be able to browse the bar in a read-only mode.

Describe the solution you'd like
Provide an option to allow browsing Bar Assistant without logging in or registering. Content that is only applicable to the current user, like favorite cocktails, settings, etc. would redirect to a login/registration.

Additional context
Coupling this with #183 might make life easier.

[Dubwize]

I would love the ability to make my bar read only and searchable by guests.

In my house, I will be the only one maintaining the bar, wife, family members, etc would only ever use it to look up a recipe that I would then make.

Technically I don't even need the bar shelf / my shelf option so being able to hide the my self would reduce UI clutter for single users such as myself.