publish docs and link to it in README (doc build failing in nimble directory)

[timotheecour]

other popular packages link to docs (generated during push to master along with CI integration).

this should be doable with nim doc --project jester.nim

examples

• https://github.com/nitely/nim-regex linking to https://nitely.github.io/nim-regex/regex.html
• as part of travis: https://github.com/kaushalmodi/std_vector/blob/master/.travis.yml linking to https://kaushalmodi.github.io/std_vector/

links

• nim doc fails for any file that imports jester: Error: undeclared identifier: 'EWOULDBLOCK' #185
• Cannot open the documentation #256
• https://vegansk.github.io/nimboost/docs/0.3.5/boost/http/jester.html

related

https://nimble.directory/pkg/jester shows doc build failing and https://nimble.directory/docs/jester shows only docs for 2 modules, eg: https://nimble.directory/docs/jester//jester/patterns.html
https://nimble.directory/ci/badges/jester/nimdevel/doc_build_output.html
tmp/nim_package_directory/cache/jester/pkgs/jester-0.4.3/jester.nim

nim doc --index:on /tmp/nim_package_directory/cache/jester/pkgs/jester-0.4.3/jester.nim
/tmp/nim_package_directory/cache/jester/pkgs/jester-0.4.3/jester/request.nim(3, 22) Error: cannot open file: jester/private/utils