[DOCS] Re-structured documentation hierarchy

docs/getting-started/installation.rst

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+==============
+Installation
+==============
+
+--------------
+With Pip
+--------------
+
+Triton can be installed directly from pip with the following command
+
+.. code-block:: python
+
+   pip install triton
+
+
+--------------
+From Source
+--------------
+
++++++++++++++++
+Python Package
++++++++++++++++
+
+You can install the Python package from source by running the following commands:
+
+.. code-block:: bash
+
+      sudo apt-get install llvm-10-dev
+      git clone https://github.com/ptillet/triton.git;
+      cd triton/python;
+      pip install -e .
+
+You can then test your installation by running the unit tests:
+
+.. code-block:: bash
+
+      pytest -vs .
+
+and the benchmarks
+
+.. code-block:: bash
+      
+      cd bench/
+      python -m run --with-plots --result-dir /tmp/triton-bench
+
++++++++++++++++
+C++ Package
++++++++++++++++
+
+Those not interested in Python integration may want to use the internals of Triton (i.e, runtime, parser, codegen, driver, intermediate representation) directly. This can be done by running the following commands:
+
+.. code-block:: bash
+
+      sudo apt-get install llvm-10-dev
+      git clone https://github.com/ptillet/triton.git;
+      mkdir build;
+      cd build;
+      cmake ../;
+      make -j8;
+
+A custom llvm-config binary can also be provided:
+
+.. code-block:: bash
+      
+      cmake ../ -DLLVM_CONFIG=/path/to/llvm-config
+
+Note that while direct usage of the C++ API is not officially supported, a usage tutorial can be found  `here <https://github.com/ptillet/triton/blob/master/tutorials/01-matmul.cc>`_