Share glossary terms from several glossary.md input files

[rowanc1]

There should be ways to share glossaries and abbreviations between files, and also between books.

Discussed in https://github.com/orgs/executablebooks/discussions/870

^{Originally posted by TomLav November 10, 2022}
Hello,

We are building a series of technical JupyterBooks that share some terms / acronyms. Each book might have its own acronyms in addition to the set of common acronyms.

Today we have to duplicate copy/paste the terms that are common in each glossary.md file (they also contain the terms that are specific to the book). This is a manual task.

Ideally, there would be a way to build a single glossary from several .md files. Then the books would share a common common_glossary.md file, and have in addition a my_glossary.md file. The resulting glossary section would be a mix of the two.

Is there a way to do that? Maybe using 'include' files (if that exists in jupyterbooks). Thanks
Thomas