Add initial page about IdP support

[sumit-bose]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @sumit-bose, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces comprehensive documentation for SSSD's Identity Provider (IdP) support. It outlines how SSSD integrates with OAuth2.0/OIDC-based IdPs such as Keycloak and EntraID to facilitate user management and authentication at the system level. The changes include a dedicated introductory page with configuration examples and an update to the overall SSSD documentation structure to reflect this new capability.

Highlights

• New IdP Documentation Page: An entirely new documentation page, idp-introduction.rst, has been added to detail SSSD's support for Identity Providers (IdPs), including concepts, supported providers like Keycloak and EntraID, and configuration examples.
• Table of Contents Update: The main table of contents (contents.rst) has been updated to include a new section for 'Identity Providers (IdP)', making the new documentation easily discoverable.
• Introduction Page Enhancement: The general introduction to SSSD (introduction.rst) has been modified to acknowledge the new IdP provider and includes a link to the sssd-idp(5) man page for further details.

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[gemini-code-assist]

Code Review

This pull request introduces initial documentation for SSSD's Identity Provider (IdP) support, which is a valuable addition. The changes include a new introduction page, updates to the table of contents, and modifications to the main introduction to mention this new feature. My review focuses on improving the clarity, grammar, and correctness of the new documentation. I've pointed out several typos in the configuration examples which are critical to fix, as they would prevent users from successfully using them. Other suggestions aim to improve readability and consistency.

[danlavu]

Some parts are a little unclear. Have you looked at this with an RST viewer? github's processing is linking the entire page. It may just be an issue with github though.

[danlavu]

Looks good, I looked at all of Gemini's grammatical suggestions. They look correct, so I would make those changes as well.

[sumit-bose]

Looks good, I looked at all of Gemini's grammatical suggestions. They look correct, so I would make those changes as well.

Hi,

all suggestions are included in the latest version.

bye,
Sumit

[alexey-tikhonov]

Thank you, ACK.