licensing: update doc links to the new doc website

[BolajiOlajide]

Test plan

All links to the old docs page docs.sourcegraph.com should be updated to their sourcegraph.com/docs equivalent.

[camdencheek]

Oof. Looks like there are more docs.sourcegraph.com links around the codebase as well. Should these be pointing to the docs for the current sourcegraph version? Right now, this just directs the user to the latest version. The /help/... route will redirect to the docs corresponding to the instance version.

[BolajiOlajide]

Oof. Looks like there are more docs.sourcegraph.com links around the codebase as well. Should these be pointing to the docs for the current sourcegraph version? Right now, this just directs the user to the latest version. The /help/... route will redirect to the docs corresponding to the instance version.

Ideally yes, but a lot of this change aren't easy to migrate without a manual check. Especially because the new docs site url structure isn't the same as the old.

I prioritized the new links added by the licensing work because it felt like the smallest change I could make this close to the release and with fewer stakeholders involved.