Proposed 0.11 docs (#727)

Proposed 0.11 docs (#727)

* Proposed 0.11 docs

* Add async section and link in

* Update docs/advanced.md

Co-Authored-By: Florimond Manca <florimond.manca@gmail.com>
* Update docs/async.md

Co-Authored-By: Florimond Manca <florimond.manca@gmail.com>
* Update docs/async.md

Co-Authored-By: Florimond Manca <florimond.manca@gmail.com>
* Update docs/quickstart.md

Co-Authored-By: Florimond Manca <florimond.manca@gmail.com>
* Update docs/async.md

Co-Authored-By: Florimond Manca <florimond.manca@gmail.com>
* Update docs/async.md

Co-Authored-By: Florimond Manca <florimond.manca@gmail.com>
* Update docs/async.md

Co-Authored-By: Florimond Manca <florimond.manca@gmail.com>
* Docs updates

* Use context-managed client instances in examples

* Update README with links to docs site, rather than to .md documents

* "99% test coverage"

* Update docs/async.md

Co-Authored-By: Florimond Manca <florimond.manca@gmail.com>
* Update docs/async.md

Co-Authored-By: Florimond Manca <florimond.manca@gmail.com>
* Add Client.close method to API docs

* Update docs/async.md

Co-Authored-By: Florimond Manca <florimond.manca@gmail.com>
Co-authored-by: Florimond Manca <florimond.manca@gmail.com>