Scripts used for generating the readme from user-contributed data

PRE-REQUISITES
--------------
1. Ensure you've got Python (V 3.6+) installed on your system
2. Clone the repository, and cd into it
3. Install the dependencies: `pip install -r lib/requirements.txt`
4. Run a script, with `python lib/[name of script].py`

SCRIPTS
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- insert_contributor_content.py - Parses and inserts content from git-in-here.yml into the README.md
- insert_resource_list.py - Inserts list of guides, and external resources into the README.md
- insert_roadmap.py - Parses the Mermaid roadmap diagram, and inserts it + edit links into README.md
- copy_resources_to_site.py - Copies resources from /guides to the website, combining with metadata
- validate_pr.py - Checks newly updated git-in-here.yml to ensure it meets some of the guidelines

DOCS
----
See the header of each script for more information on what it does, requirements and how to use it

TESTS
-----
Run `python -m unittest lib/tests/run_all_tests.py`

CONFIG
------
There are some optional environmental variables that can be set before running some scripts
- REPO_OWNER - The username / org where the repository is located (e.g. lissy93)
- REPO_NAME - The name of the repository (e.g. git-into-open-source)
- GH_ACCESS_TOKEN - A GitHub access token, required for higher rate-limit when fetching data