[Website] Better naming of specs and linking

[cconcolato]

The current list of specs (in the main page or in the coverage page) is:

ISO/IEC 14496-12 (ISOBMFF): ver7
ISO/IEC 23008-12 (HEIF): ver-1
ISO/IEC 14496-15 (NALu): ver5
ISO/IEC 14496-30 (Timed Text): ver-1
ISO/IEC 14496-14 (MP4): ver-1

Instead of "ver7", make it explicit "7th Edition".
Also, "ver-1" is not clear if this means "1st Edition" or no version (-1).
It would be good to add the date of the spec. For example 14496-12 7th edition is the 2022 edition (see https://www.iso.org/standard/83102.html).
It would be good to link the specs to this page https://github.com/MPEGGroup/FileFormat/blob/master/DocumentStatus.md so that people have direct links to download them (either from MPEG document management system if they are member, or from ISO's portal otherwise).

[DenizUgur]

Also, "ver-1" is not clear if this means "1st Edition" or no version (-1).

Right now, -1 means missing data. If there are cases where version or date may not be available then we would have to construct the text displayed on the component conditionally.

[podborski]

I will re-open this one since we still need to fill out the metadata to avoid all the -1s on the page.