Add fuzzy search to CSL.

[#84493630]
Merge pull request #82 from GovWizely/tim/csl-fuzzy

Tim/csl fuzzy
Give TradeLeads indexing ability to purge old docs.

[#84779616]
Merge pull request #84 from GovWizely/calum/trade-leads-purge-old

Give TradeLeads indexing ability to purge old docs.
CCG initial code.
Import from local markdown, search by keyword.
Split markdown into JSON objects by chapter.
Replace newlines in content with HTML breaks.
Parse by section ids in YAML, link to HTML.