docs: improve linux tar packages #15569

Fix something missing from binary tar file:

- Updated README.md to include link to repo, files list and description
- Added example bitcoin.conf, init files for daemon, RPCAuth Tool
- All files placed inside share/doc/bitcoin (lsb structure)
  using the general make install logic in the build system

This is a rebasing of PR #14167

Appveyor failed with this error:

CMake Error at scripts/cmake/vcpkg_download_distfile.cmake:156 (message):
      
      Failed to download file.
      If you use a proxy, please set the HTTPS_PROXY and HTTP_PROXY environment
      variables to "https://user:password@your-proxy-ip-address:port/".
      Otherwise, please submit an issue at https://github.com/Microsoft/vcpkg/issues
Call Stack (most recent call first):
  scripts/cmake/vcpkg_from_github.cmake:108 (vcpkg_download_distfile)
  ports/boost-proto/portfile.cmake:5 (vcpkg_from_github)
  scripts/ports.cmake:71 (include)

Does anybody have an idea how to solve it?

Appveyor failed with this error:

CMake Error at scripts/cmake/vcpkg_download_distfile.cmake:156 (message):

Probably was just an occasional download failure...

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Conflicts

Reviewers, this pull request conflicts with the following ones:

• #16141 (build: remove GZIP export from gitian descriptors by fanquake)

If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

<!--cf906140f33d8803c4a75a2196329ecb-->Needs rebase

@cisba Thanks for the contribution, however given the discussion in #14167 fizzled out, and this PR has not seen any interest, I'm going to again close it.