Change redirect URLs for standards permanent URLs to point to standards landing pages

[baskaufs]

Refer to the comment tdwg/ac#232 (comment) for an explanation. Merging this will complete the fourth checkbox at #93 (comment) .

There are two "permanent URLs" that map to standards whose status is unclear.

• /standards/312 was mapped to the draft NCD, which will be replaced when Latimer Core (Collections Description) is finished.
• /standards/640 was previously mapped to the draft ABCDDNA. The GGBN standard is its replacement. It has been ratified, but it hasn't been officially added to the list of current standards because of uncertainties about its documentation. One could assign a different permanent URL to it, but it seems to me to be appropriate to use this one, since the GGBN landing page says specifically that it replaces ABCDDNA. So anyone looking for ABCDDNA will be directed to it via the landing page. This would also follow the precedent of the SDS. The unratified version of it had the same permanent URL as the version that was eventually ratified. What needs to happen is to sort out and clean up the documents that are part of the GGBN, and then create links to ABCDDNA.

At some point I'll take on sorting this out, but not today. For now, I think these mappings of the two draft standards are appropriate.

[baskaufs]

@timrobertson100 @stanblum

Since @MattBlissett looked this over, I feel comfortable with just going ahead with the merge, since I think it is now clearly understood that the standards pages on the website are the "landing pages" for standards and therefore the "permanent URLs" should redirect there. If I don't hear any objections, I'll just do the merge later today.