Adopt Zensical-first docs configuration (#40)

## Summary
- add `.github/zensical.toml` as the documentation site configuration
- remove `.github/mkdocs.yml` to enforce a clean cut to Zensical
- preserve `-{{ REPO_NAME }}-` and `-{{ REPO_OWNER }}-` placeholders for
Process-PSModule substitution

## Result
- repository documentation configuration is Zensical-only

---------

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

Author: MariusStorhaug

.github/mkdocs.yml

@@ -27,7 +27,7 @@ permissions:
 
 jobs:
   Process-PSModule:
-    uses: PSModule/Process-PSModule/.github/workflows/workflow.yml@8b1a2617a0686ceaeadc6fa8e2f395edda93cc6d # v6.1.7
+    uses: PSModule/Process-PSModule/.github/workflows/workflow.yml@migrate-to-zensical
     secrets:
       APIKey: ${{ secrets.APIKey }}
       TestData: >-

.github/workflows/Process-PSModule.yml

@@ -0,0 +1,79 @@
+[project]
+site_name = "-{{ REPO_NAME }}-"
+repo_name = "-{{ REPO_OWNER }}-/-{{ REPO_NAME }}-"
+repo_url = "https://github.com/-{{ REPO_OWNER }}-/-{{ REPO_NAME }}-"
+
+[project.theme]
+language = "en"
+font.text = "Roboto"
+font.code = "Sono"
+logo = "Assets/icon.png"
+favicon = "Assets/icon.png"
+features = [
+  "content.code.copy",
+  "navigation.instant",
+  "navigation.instant.progress",
+  "navigation.indexes",
+  "navigation.top",
+  "navigation.tracking",
+  "navigation.expand",
+  "search.suggest",
+  "search.highlight",
+]
+
+[project.theme.icon]
+repo = "material/github"
+
+[[project.theme.palette]]
+media = "(prefers-color-scheme)"
+toggle.icon = "material/link"
+toggle.name = "Switch to dark mode"
+
+[[project.theme.palette]]
+media = "(prefers-color-scheme: dark)"
+scheme = "slate"
+primary = "black"
+accent = "green"
+toggle.icon = "material/toggle-switch-off-outline"
+toggle.name = "Switch to light mode"
+
+[[project.theme.palette]]
+media = "(prefers-color-scheme: light)"
+scheme = "default"
+primary = "indigo"
+accent = "green"
+toggle.icon = "material/toggle-switch"
+toggle.name = "Switch to system preference"
+
+[project.plugins.search]
+
+[project.markdown_extensions.toc]
+permalink = true
+
+[project.markdown_extensions.attr_list]
+
+[project.markdown_extensions.admonition]
+
+[project.markdown_extensions.md_in_html]
+
+[project.markdown_extensions.pymdownx.details]
+
+[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"]
+
+[[project.extra.social]]
+icon = "fontawesome/brands/discord"
+link = "https://discord.gg/jedJWCPAhD"
+name = "-{{ REPO_OWNER }}- on Discord"
+
+[[project.extra.social]]
+icon = "fontawesome/brands/github"
+link = "https://github.com/-{{ REPO_OWNER }}-/"
+name = "-{{ REPO_OWNER }}- on GitHub"