i18n(fr): add upgrade-to/vX.mdx guides (#8772)

* i18n(fr): add upgrade-to/v2.mdx

* i18n(fr): add upgrade-to/v1.mdx

* i18n(fr): add upgrade-to/v4.mdx

* i18n(fr): fix typo in errors/invalid-get-static-paths-entry.mdx

* i18n(fr): add upgrade-to/v3.mdx

* i18n(fr): fix broken links in upgrade-to/v3 and upgrade-to/v4

* i18n(fr): remove jsconfig mention in upgrade-to/v1.mdx

See #8818

* Update src/content/docs/fr/guides/upgrade-to/v2.mdx

Co-authored-by: Thomas Bonnet <[email protected]>

* i18n(fr): fix broken link to configuration-reference.mdx

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Co-authored-by: Chris Swithinbank <[email protected]>
Co-authored-by: Thomas Bonnet <[email protected]>
Co-authored-by: Yan <[email protected]>