x/tools/gopls: make docs discoverable

[adonovan]

A Google search for "gopls features" or "Gopls: Code transformation features" still after several weeks doesn't turn up gopls' lovingly rewritten documentation. We should fix that.

Related: @hyangah will add a feature to VS Code to make the "Browse gopls feature documentation" command more prominent.

• Add menu item for "Browse gopls feature documentation" vscode-go#3498

Also, @hyangah wonders whether the gopls markdown documentation should be canonically hosted not at GitHub but in pkg.go.dev. (I vaguely recall @rsc saying there was some reason we should not rely on pkgsite's markdown feature, but I forget what it was.) @hyangah suggested alternatively hosting them at go.dev/something.

[gabyhelp]

Related Issues and Documentation

• x/tools/gopls: support pkg.go.dev in textDocument/documentLink #35563 (closed)

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[gopherbot]

Change https://go.dev/cl/614876 mentions this issue: gopls/doc: a web server for gopls markdown docs