Merge Docker instructions into main hosting on Linux section (#111)

* added nsfetch.sh

* merged pg's docker-install guide

changes made
- removed Filezilla recommendation as the windows installer contains PUPs in the installer as options enabled by default
- added pg's `nsfetch.sh`
- changed example volumes to use defined paths instead of relative
- changed CONVARs list link to dedicated-server instead of listen

* test

* added docker-engine install guide

added Ubuntu

* Update hosting-on-linux.md

* updated docker install guide

- added debian
- added fedora

* Delete pg9182-docker-installation-guide.md

merged to Hosting on Linux

* Update docs/hosting-a-server-with-northstar/dedicated-server/hosting-on-linux.md

* commiting suggested changes

* removed pg9182-docker-installation-guide.md

* remove docker install section

* Update docs/hosting-a-server-with-northstar/dedicated-server/hosting-on-linux.md

* Delete playing-on-linux-legacy-guide.md

no longer needed, version gated

* Update docs/hosting-a-server-with-northstar/dedicated-server/hosting-on-linux.md

* re-create legacy linux guide (oops)

* Update docs/hosting-a-server-with-northstar/dedicated-server/hosting-on-linux.md

* added ending statement & link to complex docker-compose example

* Revert accidental changes to legacy guide

* added glibc statement

* undid change meant for other pr

* Update docs/hosting-a-server-with-northstar/dedicated-server/hosting-on-linux.md

* remove /mnt/ advice during file copy process & image links

* Update docs/hosting-a-server-with-northstar/dedicated-server/hosting-on-linux.md

* Apply suggestions from code review

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