restructuring for easier maintenance

- creating src packages when things can't be installed via
  actual system package
- neovim srcpkg is being worked on now

tasks/build/files/neovide/neovide.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Encoding=UTF-8
+Version=1.0
+Type=Application
+Terminal=false
+Exec={{ _neovide.install_prefix }}/bin/neovide
+Name=Neovide
+Icon={{ _neovide.install_prefix }}/share/icons/neovide.png