doc: Add FAQ for installing a different guardrails IDE extension version

[nfcodacy]

Add FAQ for installing a different guardrails IDE extension version.

[github-actions]

Overall readability score: 53.08 (🟢 +0.03)

File	Readability
codacy-guardrails-faq.md	56.92 (🟢 +7.22)

View detailed metrics

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

File	Readability	FRE	GF	ARI	CLI	DCRS
codacy-guardrails-faq.md	56.92	47.89	10.68	11.1	12.11	8.14
	🟢 +7.22	🟢 +9.88	🟢 +0.87	🟢 +1.2	🟢 +0.94	🟢 +0.32

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	53.08	42.94	10.95	12.69	12.63	7.99
	🟢 +0.03	🟢 +0.04	🟢 +0	🟢 +0.01	🟢 +0	🟢 +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