Update style guide

Fixed #8277

chore: add comment to clarify that org_id usage

As described here: https://community.grafana.com/t/many-to-many-group-dn-org-role-mapping-in-ldap-config/729/2 org_id can be used to allow multiple group_dn's to map to the same org_role provided the org_id differs.

Fixes #8262

docs: overhauled annotation docs and moved some of the data source specific annotation docs to the respective data source doc pages, closes #1111

Remove 5 lines from the codebase and an unecessary function,
by calling `strings.Replace` with -1 for the fourth argument.

A better alternative to what was merged in #8037

* Moved the animation to the pseudo element which seemed to reduce the CPU usage in an observable way.

* Removed unnecessary style

Removes dashes option from Display tab so that it is only available
for series overrides. Also removes options for dash space and length
in series overrides and just uses the default values of 10 for both of
them.

Adding support for dashed lines using jquery.flot.dashes.js

docs: fixed redirects to panel docs for old location, caused by move in bd414c17

duplicate keys for auth.github for allow_sign_up

influxdb: fixed template variable interpolation of multi valued variables when using raw query editor mode, fixes #8165