fix: documentation html looks

[germa89]

Description

Latest release broke the navbar color.

Taking advantage of this PR and also do more stuff:

• Centering navbar elements
• Moving search field to sidebar on small devices
• Moving Edit on GitHub link to the end of primary bar.
• Removing secondary sidebar in all pages. The secondary sidebar provides a page map, which allows you to move quickly to page sections. Our doc pages are not specially very big. So I am removing that sidebar so the navigation is cleaner view is cleaner. Additionally in mobile view it allows me to remove the right side menu button.

Details

Navbar color

Centering navbar elements

Before

After

Moving search field to sidebar on small devices

Before

After

Removing secondary sidebar in all pages.

Before

After

Issue linked

Close #3914

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

[ansys-reviewer-bot]

Thanks for opening a Pull Request. If you want to perform a review write a comment saying:

@ansys-reviewer-bot review

[sourcery-ai]

Reviewer's Guide

This PR restores the navbar’s intended styling and layout by refining custom CSS rules to center elements and eliminate unwanted shadows, and by updating the Sphinx configuration to streamline sidebars and navbar items.

File-Level Changes

Change	Details	Files
Refined custom CSS to center navbar content and remove shadow styling	Added .bd-navbar-elements rule for center alignment Added .bd-main .bd-content rule to center page content Overrode .sd-shadow-sm to eliminate default navbar shadow Removed redundant light/dark theme background and color overrides	doc/source/_static/custom.css
Updated Sphinx HTML theme configuration to simplify sidebars and navbar items	Introduced empty secondary_sidebar_items to disable secondary sidebars Cleared navbar_persistent entries Added primary_sidebar_end for edit/sourcelink controls Configured navbar_end with search, version and theme switchers, and icon links Removed old html_sidebars definition	doc/source/conf.py

Assessment against linked issues

Issue	Objective	Addressed	Explanation

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[sourcery-ai]

Hey @germa89 - I've reviewed your changes - here's some feedback:

• In custom.css, the .sd-shadow-sm rule is missing a semicolon after the !important declaration—please add it to ensure proper parsing.
• The old html_sidebars and commented sidebar settings in conf.py should be removed or consolidated with the new secondary_sidebar_items configuration to avoid confusion.
• After removing the theme-specific CSS overrides, test both light and dark themes to confirm the navbar and other elements retain the intended styles consistently.

Here's what I looked at during the review

• 🟡 General issues: 3 issues found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

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[germa89]

Related to: ansys/ansys-sphinx-theme#691

[germa89]

Asking sphinx/UI guys for a quick review @jorgepiloto @Revathyvenugopal162

[germa89]

Also related to: ansys/ansys-sphinx-theme#693

[germa89]

@pyansys-ci-bot LGTM.

[pyansys-ci-bot]

✅ Approving this PR because germa89 said so in here 😬