Add module documentation and enhance Dokka configuration (#261)

##  #252 Add module documentation and enhance Dokka configuration

## How Has This Been Tested?

`./gradlew :docs:dokkaGenerate`

## Changes

- Add workflow to build and publish API documentation with Dokka
- Introduce `.github/workflows/apidocs.yaml` to build and deploy API
docs on `main` and release events.
  - Configure Gradle for Dokka builds and update project dependencies.
  - Include `:docs` module in project settings.
- Introduce `Module.md` for `kotlin-sdk-server`, `kotlin-sdk-client`,
and `kotlin-sdk-core` modules.
- Update `.gitignore` to include `.idea/icon.png` and add placeholder
icon files
- Remove outdated documentation HTML files

## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [x] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [ ] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [ ] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [x] I have added or updated documentation as needed

## Additional context
<!-- Add any other context, implementation notes, or design decisions
-->

---------

Co-authored-by: devcrocod <devcrocod@gmail.com>

.github/workflows/apidocs.yaml

@@ -0,0 +1,49 @@
+name: Build and Publish API Docs to GitHub Pages
+
+on:
+  release:
+    types:
+      - published
+  # Allow running this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  deploy:
+
+    permissions:
+      pages: write      # to deploy to Pages
+      id-token: write   # to verify the deployment originates from an appropriate source
+
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          submodules: true  # Fetch Hugo themes (true OR recursive)
+          fetch-depth: 0    # Fetch all history for .GitInfo and .Lastmod
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v5
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          cache: gradle
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Generate Dokka Site
+        run: |-
+          ./gradlew :docs:clean :docs:dokkaGenerate
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v4
+        with:
+          path: build/dokka/html
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4