Redirect Subtechnique pages with dot separator instead of only forward slash

[jondricek]

It would be nice to be able to have redirection URLs set up for subtechniques such that their dot separator would go to the correct page. For example:

• T148 page: https://attack.mitre.org/techniques/T1548/
• T148.001 page: https://attack.mitre.org/techniques/T1548/001/
• Proposed redirect URL: https://attack.mitre.org/techniques/T1548.001/ (would go to main T148/001/ page above)

This should be able to be accomplished between a few sections of the code base as follows:

• Redirections module: https://github.com/mitre-attack/attack-website/tree/develop/modules/redirections
• Techniques module that generates redirections: https://github.com/mitre-attack/attack-website/blob/develop/modules/techniques/techniques.py#L24-L27