Mount all Drasi Server tutorials and fix Hugo v0.164 build errors

[ruokun-niu]

Description

Adds the newly authored Drasi Server tutorials to the docs site and fixes two build failures introduced by Hugo v0.164. Previously only Getting Started was mounted from the learning-drasi-server module; the other tutorials existed in the source repo but were never surfaced on the site.

Changes

• Mount all tutorials — added Hugo module mounts for building-comfort, high-risk-containers, and curbside-pickup alongside the existing getting-started, so each appears under Drasi Server → Tutorials.
• Fix security.allowContent build error — Hugo v0.164+ blocks text/html content by default, which caused the build to fail on HTML assets in the module (e.g. curbside-pickup/webui/src/static/index.html, the viewer app). Each mount now excludes README.md and all *.html files via the new files glob syntax.
• Migrate deprecated mount setting — replaced excludeFiles = "/README.md" (deprecated in Hugo v0.153.0) with files = ['! /README.md', '! **/*.html'].
• Fix deprecated language key — renamed languageName = "English" to label = "English" (deprecated in Hugo v0.158.0).
• Bump tutorials module — updated docs/go.mod to the latest main of learning-drasi-server so the new tutorial content resolves locally. (Production CI already pulls @main on every build.)

Type of change

• This pull request fixes a bug in Drasi and has an approved issue (issue link required).
• This pull request adds or changes features of Drasi and has an approved issue (issue link required).
• This pull request is a minor refactor, code cleanup, test improvement, or other maintenance task and doesn't change the functionality of Drasi (issue link optional).

Fixes: #263

[Copilot]

Pull request overview

This PR updates the docs site configuration to surface all Drasi Server tutorials from the learning-drasi-server Hugo module, and applies Hugo config/workflow tweaks intended to address newer Hugo deprecations and content-security build failures.

Changes:

• Mount additional tutorial folders (building-comfort, high-risk-containers, curbside-pickup) into content/drasi-server/tutorials/*.
• Migrate Hugo config away from deprecated settings (excludeFiles → files, languageName → label).
• Update the Pages deploy job condition to also allow deploys from workflow_dispatch runs on main.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
docs/go.sum	Adds checksums for the updated learning-drasi-server pseudo-version.
docs/go.mod	Bumps the learning-drasi-server module version to pick up new tutorial content.
docs/config.toml	Adds mounts for all Drasi Server tutorials and updates Hugo config keys/globs for newer Hugo behavior.
.github/workflows/website.yaml	Allows the deploy job to run for manual dispatches on main in addition to pushes.

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