feat: Readability score is not out of 100

[Weetbix]

This PR updates the readability score so that it is not shown as being out of 100. Showing the score as out of 100 is not really useful, and might lead to users thinking they should be aiming for 100/100. In reality the goal score could depend on your intended content complexity, and any increase in the number is an improvement.

Changes:

• Updates reporter
• Updates playground

[github-actions]

Overall readability score: 57.69 (🟢 +4.23)

File	Readability
README.md	62.1 (🟢 +1.67)
onboarding.md	58.9 (🟢 +3.2)
july-blog.md	52.34 (🔴 -4.23)

View detailed metrics

🟢 - Shows an increase in readability
🔴 - Shows a decrease in readability

File	Readability	FRE	GF	ARI	CLI	DCRS
README.md	12.4	14.56	18.81	25.5	14.69	8.3
	🔴 -1.67	🔴 -0.61	🔴 -0.32	🔴 -0.5	🔴 -0.12	🔴 -0.04

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	17.69	6.61	17.48	18.38	15.82	9.68
	🔴 -0.42	🔴 -0.15	🔴 -0.08	🔴 -0.13	🔴 -0.03	🔴 -0.01

View metric targets

Metric	Range	Ideal score
Flesch Reading Ease	100 (very easy read) to 0 (extremely difficult read)	60
Gunning Fog	6 (very easy read) to 17 (extremely difficult read)	8 or less
Auto. Read. Index	6 (very easy read) to 14 (extremely difficult read)	8 or less
Coleman Liau Index	6 (very easy read) to 17 (extremely difficult read)	8 or less
Dale-Chall Readability	4.9 (very easy read) to 9.9 (extremely difficult read)	6.9 or less

[Weetbix]

@noon-dawg had to merge! pls re-tick :)