[whatwg/encoding] Add additional legacy encodings (#39)

An improvement to our indexing and metrics analysis has revealed that we were incorrectly reporting on the use of some legacy encodings. A substantial number of web-exposed resources -- in particular, many generated with older hardware and exposed to the web through non-transcoding proxies -- use encodings not covered by Encoding standard. We believe it will be necessary to add support to browsers (and thus to the Encoding standard) to ensure this content remains accessible and usable.

The additional encodings are:

* cp037
* cp500
* cp875
* cp1026
* cp1140

(I was not able to get Anolis running; bit-rot appears to have set in. Someone will need to rebuild Overview.html using the Makefile after merging - sorry about that.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/encoding/pull/39

-- Commit Summary --

  * Add legacy EBCDIC encodings

-- File Changes --

    M Overview.src.html (112)
    A index-cp037.txt (0)
    A index-cp1026.txt (0)
    A index-cp1140.txt (0)
    A index-cp500.txt (0)
    A index-cp875.txt (0)
    M indexes.json (7)

-- Patch Links --

https://github.com/whatwg/encoding/pull/39.patch
https://github.com/whatwg/encoding/pull/39.diff

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