As a user, I want to configure custom OIDC providers for Homechart so I can define my providers in a config

[thequailman]

Requirements

• Change OIDC config to a struct of structs, each defining a provider with a unique name
• Remove images for sign in links? Or base64 encode.them as part of the config
• Create a new column for auth_account, oidc_ids, containing an array of oidcname:id values
• Index the column
• Convert existing OIDC logins to this format
• As a user, I want to use webauthn when I authenticate with Homechart so I can avoid using passwords #127 will use something similar, probably