Add info on recurring events to Google Calendar docs

[imchairmanm]

Also took the opportunity to document some of the operations and options more since we previously did not document a lot of functionality.

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[github-actions]

Overall readability score: 44.77 (🟢 +0.06)

File	Readability
calendar-operations.md	73.02 (-)
event-operations.md	81.47 (-)
index.md	42.83 (🟢 +0)

View detailed metrics

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

File	Readability	FRE	GF	ARI	CLI	DCRS
calendar-operations.md	73.02	52.66	7.6	8.9	10.41	6.76
	-	-	-	-	-	-
event-operations.md	81.47	53.27	6	8.1	10.18	5.48
	-	-	-	-	-	-
index.md	42.83	32.7	10.8	14.6	15.41	8.65
	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	44.77	35.62	11.37	14.59	14.21	8.42
	🟢 +0.06	🟢 +0.03	🟢 +0.01	🟢 +0.01	🟢 +0.01	🟢 +0

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

[evilnick]

🍰