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Revert "http://rnacentral -> https://rnacentral in docs, comments and hard-coded strings everywhere."

This reverts commit 43f7eba3.

The tests are under tests/, not just portal/.

Moving to postgres instead of Oracle, so I'm replacing the dependency on
oracle. In addition, I'm stripping it from the Dockerfile and the env
template. I have also altered the local_settings_default.py file to show
the new fields that have to be filled out to connect, and removed the
unsupported 'threaded' option.

Note, that this probably does not handle the exporting scripts as some
of those scripts refer directly to cx_oracle and oracle specific things.
That can be fixed later as this is enough to start working with.

* move Tech overview to the bottom
* remove unused Docker command
* minor changes in Testing

Just so people know how to run these tests.

the setup is similar to the production servers