This makes it easier to navigate inside the preview site (cause it stays
in the preview instead of jumping to the docs website), and it also
helps detecting broken links if we change the landing page (since the
one in docs.getunleash.io will still exist).
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## About the changes
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We are making a round of updates to change all references of "feature
toggle" to "feature flag".
This is also under the assumption that "Create feature toggle" in the
product UI will become "creature feature flag".
There are also formatting improvements to the docs included in this PR.
> Note: This does not include anchors and links for now.
## Discussion points
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Some of the slugs for the tutorials were handled in the config file with
the other redirects, some were handled locally in the markdown file.
This moves all the tutorial slugs to the markdown file, and fixes the
slug of the SvelteKit tutorial so it's the same as the others.
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Co-authored-by: Nnenna Ndukwe <nnenna.s.ndukwe@gmail.com>
