Remove unused files

- `./htdocs/*` duplicates the content of `pythonnet.github.io` - `./installer/*` isn't used for distribution anymore - `pythonnet.build` is no longer used as build method. - `*.{mds,,mdp}` are deprecated mono files. Deprecated since eff40df - `pythonnet_8.sln` old solution file - `pythonnet_9.sln` old solution file - `doc/mono_config.txt` outdate version of `.\Python.Runtime.dll.config` - `doc/Python.Runtime.dll.config` outdate version of `.\Python.Runtime.dll.config` - `visualstate` is a per user setting. https://groups.google.com/forum/#!topic/nunit-discuss/7aXg_usr98Q
pythonnet · vmuriart · Jan 11, 2017 · Jan 8, 2017 · Jan 8, 2017 · Jan 9, 2017
commit c13c31332c5b9e6ece79c71b0cd36ee9977a6240
diff --git a/VS_README.txt b/VS_README.txt
diff --git a/doc/Python.Runtime.dll.config b/doc/Python.Runtime.dll.config
diff --git a/doc/mono_config.txt b/doc/mono_config.txt
diff --git a/htdocs/index.html b/htdocs/index.html
diff --git a/htdocs/license.txt b/htdocs/license.txt