Missing `/out` directory in template-string-converter

**TL;DR;**
In `template-string-converter` extension's directory the `/out` folder is missing.

When I've installed `template-string-converter` in Code OSS (from Arch official repo) which by default uses OpenVSX registry the `/out` directory is missing in extension folder, which prevents it from being activated. Since VisualStudio Marketplace version doesn't have such a problem, and extension maintainer doesn't seem aware of OpenVSX existance, I suppose this issue belongs here. ¯\\\_(ツ)_/¯ Full story described in meganrogge/template-string-converter#59.

Maybe related to #163.

Inspect the publishing path for the template-string-converter extension and compare the OpenVSX package with the Visual Studio Marketplace version, using the missing /out directory as the starting symptom. Determine where the published artifact loses /out, then verify that the resulting package contains it and activates in Code OSS.

Written by the indexing model from the issue text.