postgraphile website: links fixes

[jemgillam]

Description

Fixing links across the postgraphile.org site.

For build.graphile.org links:

• Links within /postgraphile ("Draft version") link to build.graphile.org/graphile-build/5/
• Links within /versioned_docs/version-4 link to build.graphile.org/graphile-build/4/
• Links within /versioned_docs/version-5 link to build.graphile.org/graphile-build/5/

And this is reflected in /versioned_docs/version-latest ("Current version") which links to build.graphile.org/graphile-build/4/ as it is merely a symlink to /versioned_docs/version-4

The exception is linking to the Look Ahead feature, as that doesn't exist in Version 5 documentation it always links to build.graphile.org/graphile-build/4/look-ahead

Also:

• fixed some relative links
• removed hardcoded links to "edit this page"

[changeset-bot]

⚠️ No Changeset found

Latest commit: 872aaf0

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR