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

source/docs/generate-doxyfile.cmake

@@ -0,0 +1,19 @@
+if(NOT DEFINED SOURCE_DIR)
+    message(FATAL_ERROR "Please define SOURCE_DIR")
+endif()
+
+get_filename_component(SOURCE_DIR "${SOURCE_DIR}" ABSOLUTE)
+
+find_program(DOT_EXECUTABLE NAMES dot)
+
+if(NOT DOT_EXECUTABLE)
+    message(FATAL_ERROR "Please install dot and/or specify DOT_EXECUTABLE")
+endif()
+
+file(READ "${SOURCE_DIR}/VERSION" FULL_VERSION_STRING LIMIT_COUNT 1)
+string(REGEX REPLACE "(\n|\r)" "" FULL_VERSION_STRING "${FULL_VERSION_STRING}")
+string(REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)(.*)" "\\1.\\2.\\3"
+                     ROCPROFILER_VERSION "${FULL_VERSION_STRING}")
+
+configure_file(${SOURCE_DIR}/source/docs/rocprofiler.dox.in
+               ${SOURCE_DIR}/source/docs/rocprofiler.dox @ONLY)