Indigneous engagement session's discussion documents

**As a [description of user]?**
As a member of the general public who identifies as part of Indigenous

**I want to [functionality]**
I want to be provided with discussion documents prior the engagement session in a timely manner

**So that [benefit]**
So that I can consult the documents, decide if I wish to participate and prepare for the engagement.

**Additional context**
Relates to #164
_- (CleanBC Roadmap to 2030 Implementation Recommendations)_

**Acceptance Criteria**
- Documents must be provided at least one month in advance and not less than a week.