Fix directory listing in https://docs.atlassian.com/bamboo-specs-docs

Issue Summary

https://docs.atlassian.com/bamboo-specs-docs provides a list of legacy specs references. Documentation links for newer releases are not provided on that page leading to confusion about whether they are available or not.

Steps to Reproduce

1. Access https://docs.atlassian.com/bamboo-specs-docs
2. Noticed that the directory list only covers Specs up to 6.2.3 + the latest

Expected Results

Either:

• An updated directory list of references Specs x Bamboo versions
• A well-formed template page/style with links for every Bamboo Specs release available.

Actual Results

Reference links are only provided for Bamboo Specs up to 6.2.3

Workaround

Access the required documentation by reaching to:

• https://docs.atlassian.com/bamboo-specs-docs/x.y.z
• Where (x.y.z) equals to the Bamboo version