Road to rch

[iherman]

This transforms the original lds charter into what we envisage as an rch WG charter proposal. Meaning

• the list of deliverables have been cut back
• the list of use cases have been pruned accordingly
• the lds -> rch means a number of names, links, etc., have changed

Furthermore

• I have added a reference to a paper after some emails with Aidan (just to be more complete with references)
• I have removed my name as a staff contact (and marked it as a T.B.D. for now)

Note that once this PR is merged, the repository should be renamed to w3c/rch-wg-charter.

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[iherman]

Some minor punctuation and language tweaks

Thanks @TallTed, I appreciate it!

[iherman]

Merging to publicly become RCS and saying farewell to LDS. The final wordsmithing can still happen in the new setup.