Remove duplicate sidebar header in docs nav (#71)

## Summary
- remove the 
avigation.indexes feature from .github/zensical.toml to drop the
redundant left sidebar header
- align palette and theme settings with PSModule/docs (black/light-blue
palette, material theme icons, and matching navigation/search feature
toggles)
- align TOC permalink style with PSModule/docs

## Why
The docs navigation had a duplicated section header in the left menu,
and this also brings Sodium docs styling/settings closer to the PSModule
docs baseline.

## Testing
- docs config change only; no runtime/module code changes

---------

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: MariusStorhaug

.github/zensical.toml

@@ -1,23 +1,37 @@
 [project]
 site_name = "Sodium"
+site_url = "https://psmodule.io/Sodium/"
 repo_name = "PSModule/Sodium"
 repo_url = "https://github.com/PSModule/Sodium"
+edit_uri = "edit/main/"
+copyright = "Copyright © 2023 - 2025 PSModule"
 
 [project.theme]
 variant = "classic"
 language = "en"
+font.text = "Mona Sans"
+font.code = "Source Code Pro"
 logo = "Assets/icon.png"
 favicon = "Assets/icon.png"
 features = [
+    "announce.dismiss",
+    "content.action.edit",
+    "content.action.view",
+    "content.code.annotate",
     "navigation.instant",
+    "navigation.instant.prefetch",
+    "navigation.instant.preview",
     "navigation.instant.progress",
-    "navigation.indexes",
+    "navigation.footer",
     "navigation.top",
     "navigation.tracking",
     "navigation.expand",
     "search.suggest",
     "search.highlight",
-    "content.code.copy"
+    "search.share",
+    "content.code.copy",
+    "content.tooltips",
+    "toc.follow"
 ]
 
 [[project.theme.palette]]
@@ -29,41 +43,52 @@ toggle.name = "Switch to dark mode"
 media = "(prefers-color-scheme: dark)"
 scheme = "slate"
 primary = "black"
-accent = "green"
+accent = "light blue"
 toggle.icon = "lucide/moon"
 toggle.name = "Switch to light mode"
 
 [[project.theme.palette]]
 media = "(prefers-color-scheme: light)"
 scheme = "default"
-primary = "indigo"
-accent = "green"
+primary = "black"
+accent = "light blue"
 toggle.icon = "lucide/sun"
 toggle.name = "Switch to system preference"
 
 [project.theme.icon]
-repo = "fontawesome/brands/github"
+repo = "material/github"
+link = "material/link-variant"
+
+[project.plugins.meta]
+
+[project.plugins.search]
 
 [project.markdown_extensions.toc]
-permalink = true
+permalink = "#"
 
 [project.markdown_extensions.attr_list]
+[project.markdown_extensions.abbr]
 [project.markdown_extensions.admonition]
+[project.markdown_extensions.def_list]
+[project.markdown_extensions.footnotes]
 [project.markdown_extensions.md_in_html]
+[project.markdown_extensions.tables]
 [project.markdown_extensions.pymdownx.details]
 [project.markdown_extensions.pymdownx.superfences]
+[project.markdown_extensions.pymdownx.tasklist]
+custom_checkbox = true
 
 [[project.extra.social]]
 icon = "fontawesome/brands/discord"
 link = "https://discord.gg/jedJWCPAhD"
 name = "PSModule on Discord"
 
+[[project.extra.social]]
+icon = "material/powershell"
+link = "https://www.powershellgallery.com/profiles/PSModule.io"
+name = "PSModule on the PowerShell Gallery"
+
 [[project.extra.social]]
 icon = "fontawesome/brands/github"
 link = "https://github.com/PSModule/"
 name = "PSModule on GitHub"
-
-[project.extra.consent]
-title = "Cookie consent"
-description = "We use cookies to recognize your repeated visits and preferences, as well as to measure the effectiveness of our documentation and whether users find what they're searching for. With your consent, you're helping us to make our documentation better."
-actions = ["accept", "reject"]