* docs: Improve error handling docs
and add more TL;DRs and new sections about handling specific errors, and
logging errors.
* contributing: Add more coding tips
* docs: Describe how to handle Options as errors
* CONTRIBUTING: Add tips for code contributions
which will be home to condensed tips and best-practices around the
zellij code. Currently explains to prefer returning `Result` types
instead of `unwrap`ing on them.
The tips in here are meant to be short, concise guides that allow the
user to get started without a lot of reading. The individual tips can
(and should) be supplemented with links to "further reading" where the
topic at hand is explained in greater detail.
* docs: Add ERROR_HANDLING
that explains how we plan to change error handling in zellij and invites
new contributors to join the fun. Details the currently existent error
handling capabilities and gives a bunch of examples taken from #1670.
* utils/errors: Shorten docblock
by moving previous content under "Help Wanted" to the new
`docs/ERROR_HANDLING` document and link to the document instead.
