feat(golang): remove use of goenv

It's simpler to just have a single version of Go available, with goenv
lots of different modules/packages which have `.go-version` files, the
LSP server doesn't work correctly unless the specific version of Go is
installed.

zsh/golang.zsh

@@ -2,20 +2,6 @@
 # Go (golang) environment setup.
 #
 
-# ==============================================================================
-# goenv
-# ==============================================================================
-
-# install goenv
-zinit ice wait lucid as'program' pick'bin/goenv' from'gh' \
-  atclone'src/configure && make -C src; libexec/goenv init - > .zinitrc.zsh' \
-  atpull'%atclone' src'.zinitrc.zsh' nocompile'!'
-zinit light syndbg/goenv
-
-zinit ice wait lucid as'program' pick'plugins/go-build/bin/go-build' from'gh' \
-  id-as'syndbg/go-build'
-zinit light syndbg/goenv
-
 # ==============================================================================
 # global golang packages
 # ==============================================================================
@@ -42,7 +28,7 @@ install_go_global_packages() {
 
   for package in "${packages[@]}"; do
     echo "installing/updating \"$package\""
-    go get -u "$package"
+    GO111MODULE=on go get -u "$package"
   done
 
   if command-exists goenv && [ "$(goenv version-name)" != "system" ]; then

zshenv

@@ -150,8 +150,8 @@ path_prepend "/opt/emacs/bin"
 path_prepend "/opt/tmux/bin"
 
 # Go setup for golang (./zsh/golang.zsh)
-path_prepend "$HOME/.goenv/shims"
-export GOENV_GOPATH_PREFIX="$HOME/.goenv/go"
+export GOPATH="$HOME/.go"
+path_prepend "$GOPATH/bin"
 
 # Ruby setup for rbenv (./zsh/ruby.zsh)
 path_prepend "$HOME/.rbenv/shims"