Create a subpage for hosting release notes

[devendran-m]

As a developer/user I would like to access current and previous release notes from fondant.dev website.

---

Create a subpage for hosting release notes.

• The first subpage can be fondant.dev/releases.
• Host one child page each per release under fondant.dev/releases
• The child page can be fondant.dev/releases/v1.1.0

• ---

  Screen mockups, for reference;

---