Add “change password” shortcut on the JupyterHub main page

[kathoef]

Proposed change

Add a "change password" button to the JupyterHub navigation bar, which points to the already existing ".../hub/auth/change-password" page. (Similar to what nativeauthenticator has.)

Alternative options

I don't really see an alternative. Most web pages that require a login, also provide an easily accessible "change password" button and/or field, so it would be good to stick with that expectation? ;-)

Who would use this feature?

Every user of a JupyterHub instance (e.g. TLJH) that utilizes the firstuseauthenticator. Currently, it's not obvious, that a change password functionality even exists. (And users IMHO do not likely stumble across it themselves via e.g. reading the community docs.)

(Optional): Suggest a solution

Implementing this might be as simple as using this template e.g. from the nativeauthenticator?

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[InCogNiTo124]

Bump, this would be excellent functionality!