* Add markdown linting

- add linter default rules
- adapt rules to current code
- fix the code for linting to pass
- add CI check

fix #1243

* Fix markdown for Substrate
* Fix tooling install
* Fix workflow
* Add documentation
* Remove trailing spaces
* Update .github/.markdownlint.yaml

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
* Fix mangled markdown/lists
* Fix captalization issues on known words

* CI: Add feature sorting check

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Sort all features

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Add some mistakes

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Revert "Add some mistakes"

This reverts commit b2b1099f979f6decb22d09b46689c1554bb72e81.

* CI job naming

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Add oneliner formatting

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Explain tool

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Use latest version

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Better erorr message

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Format after master merge

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Use --check option

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Messed up the merge commit...

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* moved client code out of primitives

* bump ci

* Fixup from merge.

* Removed unused deps thanks to review feedback

* Removing unneeded deps

* updating lock file

* note about rustfmt

* fixed typo to bump ci

* Move lonely CacheKeyId to parent

* cargo fmt

* updating import style

* Update docs/STYLE_GUIDE.md

Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>

Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>

* Remove dead link to out-of-date style guide

* Replace dead link with self-hosted doc

* Use relative link to style guide

Co-authored-by: Benjamin Kampmann <ben@gnunicorn.org>

* Format style guide

Co-authored-by: Benjamin Kampmann <ben@gnunicorn.org>

* Formatting

Co-authored-by: Benjamin Kampmann <ben@gnunicorn.org>