docs: Update the Protocol Kit guide to execute transactions

[germartinez]

Context

This PR:

• Updates the Protocol Kit guide that showcases how to execute transactions. The previous one was outdated and the format was not in line with the current guides.

[github-actions]

Branch preview

✅ Deployed successfully in branch deployment:

https://protocol_kit_guide--docs.review.5afe.dev

[github-actions]

Overall readability score: 30.84 (🔴 -0.56)

File	Readability
execute-transactions.mdx	40.96 (🔴 -28.19)

View detailed metrics

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

File	Readability	FRE	GF	ARI	CLI	DCRS
execute-transactions.mdx	40.96	40.82	14.96	18.8	11.33	7.32
	🔴 -28.19	🔴 -16.14	🔴 -5.85	🔴 -8.9	🔴 -0.49	🔴 -0.58

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	30.84	26.31	13.53	18.1	15.94	8.78
	🔴 -0.56	🔴 -1.01	🟢 +0.17	🔴 -0.69	🔴 -0.21	🟢 +0.19

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