Change documentation to a better format (#25)

Added new documentation style, added Authentik & Authelia examples. THank you Hendrik & Ivan!

---------

Co-authored-by: Hendrik Sievers <89412959+hendrik1120@users.noreply.github.com>
Co-authored-by: Ivan Vasquez <ivanvasquezp@outlook.com>

docs/provider-configurations/authelia.md

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+# Authelia
+
+## Public client configuration
+
+> [!NOTE]  
+> This configuration strictly requires a HTTPS redirect uri.
+
+Authelia `configuration.yml`
+```yaml
+identity_providers:
+  oidc:
+    ## The other portions of the mandatory OpenID Connect 1.0 configuration go here.
+    ## See: https://www.authelia.com/c/oidc
+    clients:
+      - client_id: 'homeassistant'
+        client_name: 'Home Assistant'
+        public: true
+        require_pkce: true
+        pkce_challenge_method: 'S256'
+        authorization_policy: 'two_factor'
+        redirect_uris:
+          - 'https://hass.example.com/auth/oidc/callback'
+        scopes:
+          - 'openid'
+          - 'profile'
+          - 'groups'
+        userinfo_signed_response_alg: 'RS256'
+```
+
+Home Assistant `configuration.yaml`
+```yaml
+auth_oidc:
+    client_id: "homeassistant"
+    discovery_url: "https://auth.example.com/.well-known/openid-configuration"
+```
+
+## Confidential client configuration:
+
+Authelia `configuration.yml`
+```yaml
+identity_providers:
+  oidc:
+    ## The other portions of the mandatory OpenID Connect 1.0 configuration go here.
+    ## See: https://www.authelia.com/c/oidc
+    clients:
+      - client_id: 'homeassistant'
+        client_name: 'Home Assistant'
+        client_secret: '$pbkdf2-sha512$310000$c8p78n7pUMln0jzvd4aK4Q$JNRBzwAo0ek5qKn50cFzzvE9RXV88h1wJn5KGiHrD0YKtZaR/nCb2CJPOsKaPK0hjf.9yHxzQGZziziccp6Yng'  # The digest of 'insecure_secret'.
+        public: false
+        require_pkce: true
+        pkce_challenge_method: 'S256'
+        authorization_policy: 'two_factor'
+        redirect_uris:
+          - 'https://hass.example.com/auth/oidc/callback'
+        scopes:
+          - 'openid'
+          - 'profile'
+          - 'groups'
+        userinfo_signed_response_alg: 'RS256'
+        token_endpoint_auth_method: 'client_secret_post'
+```
+
+Home Assistant `configuration.yaml`
+```yaml
+auth_oidc:
+  client_id: "homeassistant"
+  client_secret: "insecure_secret"
+  discovery_url: "https://auth.example.com/.well-known/openid-configuration"
+```

docs/provider-configurations/authentik.md

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+# Authentik
+
+## Public client configuration
+Under construction.
+
+## Confidential client configuration
+
+1. From the admin interface, go to `Applications > Providers` and click on `Create`
+2. Select `OAuth2/OpenID Provider` and click `Next`
+3. Fill the following details:
+    - Name: `Home Assistant Provider`
+    - Authorization flow: `default-provider-authorization-explicit-consent`
+    - Client type: `Confidential`
+    - Client ID: `homeassistant`
+    - Client Secret: **Copy this value**
+    - Redirect URIs/Origins: Click on `Add entry` (You can use either DNS, Internal/External IP or localhost)
+        - Strict: https://hass.example.com/auth/oidc/callback
+4. Click `Finish` to save the provider configuration
+5. Open the created Provider 
+6. On the Assigned to application section click on `Create`:
+    - Name: `Home Assistant`
+    - Slug: `home-assistant`
+    - Provider: `Home Assistant Provider`
+    
+    Then save the configuration
+
+## Home Assistant configuration
+
+> [!IMPORTANT]  
+> For HTTPS configuration make sure to have a public valid SSL certificate (i.e. LetsEncrypt), if not, use HTTP instead (more insecure) or add your Authentik CA certificate to `network.tls_ca_path`.
+
+After installing this HACS addon, edit your `configuration.yaml` file and add:
+```yaml
+auth_oidc:
+  client_id: "homeassistant"
+  client_secret: "client_secret"
+  discovery_url: "https://auth.example.com/application/o/home-assistant/.well-known/openid-configuration"
+```
+
+Restart Home Assistant and go to https://hass.example.com/auth/oidc/welcome

docs/provider-configurations/other.md

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+# Other providers
+Under construction.

docs/provider-configurations/pocket-id.md

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+# Pocket ID
+Under construction.