Add documentation lookup support. (#53)

* Allow users to query documentation link.

* Show symbol signature and excerpt from docs.

* Use `•` character for showing list items.

* Trim whitespace after two newlines.

* Allow users to query documentation link.

* Show symbol signature and excerpt from docs.

* Use `•` character for showing list items.

* Trim whitespace after two newlines.

* Add docstrings, simplify command.

* Use a cache for getting doc embeds.

* Suppress `urllib3` log messages below WARNING.

* Use shared `http_session` on the bot.

* Comment `fetch_initial_inventory_data`, unpack URL directly.

* Address various review comments.

- use `str.format` for generating the stdlib documentation URLs
- move `convert_code` comment to a docstring
- fix up python syntax parsing by not using a `*`
- send red error embeds when documentation could not be found

* Use `lxml` for HTML parsing.

* Pin yarl to 1.1.1

* Use the website's API as package documentation metadata database.

* Fetch inventories concurrently.

* Use red error embed & error title on error.

* Add examples to command docstrings.

* Use typing notifications instead of edits.

* Flush cache on inventory refresh.

* Address @martmists' review comments.

* Use `BadArgument` instead of custom exception class.

* Move universal converters to `bot/converters.py`.

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