Fixed the broken Docker Installation Link

[Lawful2002]

fixes #547
Fixed the broken Docker Installation link in the README.rst file under the 'Setting up VulnerableCode' section

[Hritik14]

Thanks for spotting this. Before anything, please add DCO to the commit. You can do it by git commit --amend -s (make sure you agree to the DCO)
Also, I think this would still be breaking RTD @ https://vulnerablecode.readthedocs.io because of
https://github.com/nexB/vulnerablecode/blame/main/docs/source/index.rst#L23
We should entirely separate the RTD Readme file from the GitHub project readme.

[AyanSinhaMahapatra]

We should entirely separate the RTD Readme file from the GitHub project readme.

Maybe it's better to have full RTD links instead of having file links?
My bad though, I should have checked the links when importing the file in RTD.

I.e. here link directly to: https://vulnerablecode.readthedocs.io/en/latest/getting-started/docker_installation.html

[Lawful2002]

@Hritik14, So instead of linking the file, should I link https://vulnerablecode.readthedocs.io/en/latest/getting-started/docker_installation.html as suggested by @AyanSinhaMahapatra

[Hritik14]

We could to do that for now but hard coding a url doesn’t feel right to me (for eg: it’s pinned on the latest version via the url)

I’m writing a fresh documentation anyway so absolute url wouldn’t be a problem for the time being.

[Lawful2002]

@Hritik14 I have made the changes (including the DCO), can you review them?

[Hritik14]

LGTM, thanks for the contribution.