build: discontinue CDN builds

[KnorpelSenf]

They started failing because we had to pin the Deno version to 1.21 and we want to use TS features introduced after that. No one is actually using the CDN, so we might as well stop uploading new versions. The old ones will stay there for a while (until next major).

Instead, people can use https://bundle.deno.dev which appeared in the meantime and does the same thing.

This PQ

• removes the bundling infra
• removes the CI setup
• updates the docs in the README

Note that the web builds at grammy/web remain unaffected, as they do not rely on deprecated APIs. In fact, this PQ updates the tooling for them, too.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (5c77a00) 35.10% compared to head (8d3e4ac) 35.10%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #393   +/-   ##
=======================================
  Coverage   35.10%   35.10%           
=======================================
  Files          16       16           
  Lines        4785     4785           
  Branches      168      168           
=======================================
  Hits         1680     1680           
  Misses       3103     3103           
  Partials        2        2           

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[rojvv]

LGTM.