Added Article: Improving SEO with Strict Routing and SEF URLs

[LalitNarayanYadav]

Summary

This PR adds a user manual article explaining how to improve SEO in Joomla 5 using SEF URLs and Strict Routing.

Details

• Introduced SEF URLs with before/after examples.
• Step-by-step guide on enabling SEF URLs and Strict Routing via Global Configuration.
• Benefits for SEO and user experience.
• Final tips for avoiding common configuration pitfalls.

Note

This PR partially addresses #6 by covering the Improving SEO with Strict Routing and SEF URLs topic mentioned in the issue.

Follow-up

• Additional topics from Joomla 5 articles in the wiki, not yet in this user manual #6 can be added in separate PRs.
• Screenshots can be included in a future enhancement PR.

[ceford]

It is great that we have someone working on documentation who is comfortable with Markdown!

However, the topic of this PR is covered in at least two places. There is an article on Global Configuration. You can see it here: https://jdocmanual.org/en/jdocmanual?article=user/configuration/global-configuration (use Global and configuration in the search box to find stuff). That was the source of the article in the Sandbox: https://docs-core.sandbox.joomla.org/user-manual/configuration/configuration-global-configuration

We also have an article on SEO Basics: https://jdocmanual.org/en/jdocmanual?article=user/seo/seo-basics or https://docs-core.sandbox.joomla.org/user-manual/seo/seo-seo-basics

See also the other articles in the SEO sections in both sources.