docs for web server config

[Ed McDonagh]

Add docs for customising the web server or adding SSL. See issue ref #845 and https://bitbucket.org/openrem/docker/pull-requests/1/issue845editablenginxconf

Works as is, there is an example SSL version of the config but it needs at least some brief docs.

Not sure how this works with virtual_directory installs.

[Ed McDonagh]

First draft of webserver config docs. Refs #848 [skip ci] docs only

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[Ed McDonagh]

Code block not indented. Refs #848 [skip ci] docs only

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[Ed McDonagh]

Minor grammar corrections. Refs #848 [skip ci] docs only

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[Ed McDonagh]

First attempt at virtual_directory docs in a Docker world. Refs #848 [skip ci] docs only

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[Ed McDonagh]

Minor tweaks. Refs #848 [skip ci] docs only

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[Ed McDonagh]

Start containers before running command, thanks @wens. Removed resetting of VIRTUAL_DIRECTORY at end of settings. Refs #848 [skip ci] nearly docs only!

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[Ed McDonagh]

Merged in issue848webserverdocs (pull request #387)

Fixes #848

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