move build commands to Deno tasks
upgrade to Deno 1.28 and its new lock system
use stricter type checking enforced in Deno 1.25
deps: bump Deno stdlib to 0.145
In addition to mechnically going to the newest Deno stdlib, this also
updates the collections/ inclusions to follow contemporary best
practices, which avoid using the mod.ts.
Fixes: https://todo.sr.ht/~bmp/hayom/10
add deno.json for building dependencies
deps: bump Deno stdlib to 0.144
deps: bump Deno stdlib to 0.142
deps: bump Deno stdlib to 0.136
update dependencies and Deno version
readme: fix up community docs