Fix documentation for Wikimedia SSO

[HungNgien]

This PR resolves #500

Summary by Sourcery

Update the documentation for setting up Wikimedia single sign-on (SSO) and correct the callback URL for Google, GitHub, and Wikimedia providers. Standardize the terminology used for client ID and secret across different providers in the settings.

Enhancements:

• Use a fixed callback URL for Google, GitHub, and Wikimedia OAuth applications.

Documentation:

• Improve instructions for setting up MediaWiki OAuth application by adding detailed steps and clarifying terminology.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR updates the documentation for setting up Wikimedia SSO and fixes the callback URL for Google, GitHub, and Wikimedia providers. It also updates the labels for client ID and secret in the admin settings.

Sequence diagram for SSO authentication flow

sequenceDiagram
    participant User as User
    participant App as Eventyay App
    participant Auth as OAuth Provider

    User->>App: Click Login with SSO
    App->>Auth: Redirect to OAuth provider
    Auth->>User: Show login page
    User->>Auth: Enter credentials
    Auth->>App: Redirect to callback URL with auth code
    Note right of App: Updated callback URLs:
    Note right of App: app.eventyay.com/tickets/accounts/
    Note right of App: {provider}/login/callback/
    App->>Auth: Exchange code for tokens
    Auth->>App: Return tokens
    App->>User: Complete login

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File-Level Changes

Change	Details	Files
Updated documentation for Wikimedia SSO setup	Added detailed steps for registering an OAuth application on Wikimedia. Included instructions for selecting specific permissions: Basic Rights and Access private information. Clarified the terminology used for consumer token and secret, now referred to as client application key and secret. Updated the copy on the next page to instruct the user to copy the client application key and secret after successful registration on Wikimedia.	src/pretix/plugins/socialauth/templates/socialauth/social_setup.html
Fixed callback URLs for Google, GitHub, and Wikimedia providers	Replaced template variable with hardcoded callback URL for all three providers to https://app.eventyay.com/tickets/accounts//login/callback/	src/pretix/plugins/socialauth/templates/socialauth/social_setup.html
Updated client ID and secret labels in admin settings	Added conditional label for "Client ID" and "Secret" input fields based on provider. For Wikimedia, the labels are now "Client Application Key" and "Client Application Secret" respectively.	src/pretix/plugins/socialauth/templates/socialauth/social_auth_settings.html
Removed unused tickets_domain variable	Removed the tickets_domain variable from the get_context_data method as it is no longer used in the templates.	src/pretix/plugins/socialauth/views.py

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#500	Fix the description for the form elements for Wikimedia to: Client Application Key and Client Application Secret	✅
#500	Update the documentation for Wikimedia OAuth application registration process with detailed steps	✅
#500	Delete the sentence: 'Choose option: User identity verification only with access to real name and email address, no ability to read pages or act on a user's behalf.'	✅

Possibly linked issues

• Fix documentation for Wikimedia SSO #500: The PR updates the documentation as requested in the issue, changing labels and adding steps for setting up Wikimedia SSO.

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