Docs skeleton (#51)

* Add doxygen-awesome-css submodule

* Basic documentation files

- conf.py: run by sphinx
- about.md: info about rocprofiler
- features.md: overview of features
- installation.md: build/test/install instructions
- index.md: sets up main page
- generate-doxyfile.cmake: generates rocprofiler.dox with rocprofiler-specific info
- environment.yml: conda environment
- Makefile: sphinx makefile
- README.md: build instructions
- rocprofiler.dox.in: doxygen template
- .gitignore: ignores generated files
- .nojekyll: prevents GitHub Pages from using Jekyll for deployment of pages

* Documentation scripts

- scripts for doing common sequences of commands for building docs
- update-docs.sh: builds the docs and installs the docs if /docs directory is present
- update-doxygen.sh: quick script for generating doxygen

* Workflow for docs

- step for building docs
- step for deploying docs

* Update doxygen comments in include/rocprofiler

- rocprofiler.h / rocprofiler_plugins.h
  - fixed non-existent global references in doxygen comments
  - fixed parameter names that were incorrect or not updated

* Update docs workflow

- only deploy docs when on main branch

.github/workflows/docs.yml

@@ -0,0 +1,74 @@
+name: Documentation
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [main]
+    paths:
+      - '*.md'
+      - 'source/docs/**'
+      - 'source/scripts/update-docs.sh'
+      - '.github/workflows/docs.yml'
+      - 'VERSION'
+  pull_request:
+    branches: [main]
+    paths:
+      - '*.md'
+      - 'source/docs/**'
+      - 'source/scripts/update-docs.sh'
+      - '.github/workflows/docs.yml'
+      - 'VERSION'
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+env:
+  GIT_DISCOVERY_ACROSS_FILESYSTEM: 1
+
+jobs:
+  build-docs:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pages: write
+      id-token: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+            submodules: true
+      - name: Install Conda
+        uses: s-weigand/setup-conda@v1
+      - name: Setup Pages
+        uses: actions/configure-pages@v2
+      - name: Create Docs Directory
+        run:
+          mkdir -p docs
+      - name: Update Docs
+        working-directory: source/docs
+        run: |
+          conda env create -n rocprofiler-docs -f environment.yml
+          source activate
+          conda activate rocprofiler-docs
+          ../scripts/update-docs.sh
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v2
+        with:
+          path: ./docs
+
+  deploy-docs:
+    if: github.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    needs: build-docs
+    permissions:
+      contents: read
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v2