Add documentation generation support files to Linux packages (#2422)
Add documentation generation support files to Linux packages (#2422)

As part of #2291, we decided that we would package the documentation
generation support files that are located in .docs/ into the installed
packages in `docs-support`. This will allow them to be used not only
when Pony is released to update the standard library website but also
when users are running for known ponyc projects.
kulibali/ponyc,sgebbie/ponyc,kulibali/ponyc,CausalityLtd/ponyc,cquinn/ponyc,jemc/ponyc,CausalityLtd/ponyc,kulibali/ponyc,Theodus/ponyc,sgebbie/ponyc,jemc/ponyc,dipinhora/ponyc,ponylang/ponyc,Praetonus/ponyc,dipinhora/ponyc,ponylang/ponyc,sgebbie/ponyc,Praetonus/ponyc,Theodus/ponyc,cquinn/ponyc,cquinn/ponyc,cquinn/ponyc,sgebbie/ponyc,sgebbie/ponyc,Theodus/ponyc,jemc/ponyc,Praetonus/ponyc,CausalityLtd/ponyc,ponylang/ponyc,Theodus/ponyc,dipinhora/ponyc,kulibali/ponyc,Praetonus/ponyc,Theodus/ponyc