URLs are inconsistent

• Problem

URLs to the same technique, software, mitigation, or group page are inconsistent.

• Detail

URLs to the same object are inconsistent. For example,

1. /techniques/T1595/ (in href attributes in anchor tags)
2. /techniques/T1595/index.html (in index.json used in ATT&CK object search)

Both URLs lead us to the same object (the same web content).
There are many incosistent URL expressions in ATT&CK, such as the example above.

If there is no reason, I would like to suggest unifying the them into a single URL format as shown in the solution section below.

• Solution

I would go for something like "/techniques/T1595/" with "/" and without "index.html" at the end.
That is what you get when you click the links in the ATT&CK pages.
As for 'without "index.html"', the ATT&CK pages are currently static,
but they might be generated dynamically in the future.
It would be safe not to specify "index.html", to be prepared for dynamic HTML generation.

• Additional improvement

Not in this repo, but ATT&CK STIX 2 JSON file has URLs like "/technique/T1595" in its external_references.
I believe that they should be consistent with URLs in this repo.
When the standard is set, I will raise an issue for the ATT&CK STIX 2 JSON file.

Start by locating the anchor href attributes and index.json entries that reference ATT&CK objects. Normalize equivalent URLs to the trailing-slash form without index.html, then verify that links and object-search results still resolve to the same pages.