CKAN Extensions registry and website.

How it Works

Extension Master List - maintained in Google Spreadsheet
- name (id), title, url plus editorial information (show, featured etc) for all extensions we know about
Metadata plus README for each extension is stored into `extensions/{extension-id}.md
- Metadata attributes stored in frontmatter and README into the body
- What extensions we store is driven by the master list (we download all extensions with show column = 1)
- Script to do this is scripts/generate.py

Managing Updates and Building the Site

Add extension information to the master list (whether we plan to show the extension or not).
Then set show column value to 1 to have the extension included in the public extension registry.
Generate the local page for the extension or extensions using the generate.py script:

(Re)-generate just one extension page:
```
python scripts/generate.py {name-of-extension}
```
(Re)-Generate pages for all extensions:
```
python scripts/generate.py
```