Fix broken links in configuration/index.md

[7flying]

All the internal links are broken in configuration/index.md, this fixes it and uses full paths so that broken links are easier to spot in the future.

[softwarefactory-project-zuul[bot]]

Build succeeded. https://softwarefactory-project.io/zuul/t/packit-service/buildset/c5425d6a64d342b4981793ee0ff440de

:heavy_check_mark: pre-commit SUCCESS in 1m 13s

[7flying]

@lbarcziova sorry for the direct ping! can you take a look? thanks!

[7flying]

thanks so much for the contribution!

Could you please elaborate what is the issue with relative links? (checking https://packit.dev/docs/configuration and they work fine)

At the time when this PR was sent, links redirecting to configuration/foo would redirect you to packit.dev/docs/configuration/configuration/foo (note the two configuration), instead of packit.dev/docs/configuration/foo, yielding a 404 error.

The page seemed to be using redirects that did not work, other redirects were using ./configuration/foo which did work, and overall there is a mixture of full redirect paths (e.g. /docs/configuration/foo) with non-full redirect paths that did and did not work at the same time (./configuration vs /configuration).

So, this PR fixed the broken links and changed all the links to the full redirect path for consistency and to avoid mistakes in the future.

[softwarefactory-project-zuul[bot]]

Build succeeded. https://softwarefactory-project.io/zuul/t/packit-service/buildset/4cfc678402284022aeabf575f9e30b6e

:heavy_check_mark: pre-commit SUCCESS in 1m 11s

[lbarcziova]

regate

[softwarefactory-project-zuul[bot]]

Build succeeded (gate pipeline). https://softwarefactory-project.io/zuul/t/packit-service/buildset/4902cef6791c46c7baea983b931ff3c3

:heavy_check_mark: pre-commit SUCCESS in 2m 15s