Add publication guides for each data source

[StephenAbbott]

To better explain the details and nuances about the data sources republished via https://bods-data.openownership.org, we should provide a publication guide for each source detailing information about the source register, how the data has been processed and how it is made available via the BODS data analysis tools.

The publication guides should also feature a list of known mapping/transformation issues which users can bear in mind along with a list of the latest errors/issues OO has experienced when transforming the data. Explore whether this should be automatically pulled from the data notebooks which are used to update the BODS data analysis tools.

[kd-ods]

@kathryn-ods - I just saw this ticket. The GLEIF publication guidance will be our first attempt at this. We'll need to consider how users get to it from the Data Analysis Tools front end

[kathryn-ods]

This is the finished data use guide for GLEIF 0.2 - to be shared when we publish the data https://docs.google.com/document/d/16bloRcAcDTM9SFTYJC6xiS3BFSev_T8mXoQSi2Us-Zg/edit?usp=sharing