地名の maxzoom を調整

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Close #149

首都の maxzoom を 11に、その他の地名を 13 に設定

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✅ Style Rendering Time

Zoom	Difference in Means [sec.]	Mean ± Standard Deviation [sec.]	Mean ± Standard Deviation [sec.] (Production)	Significant Difference
5	+0.924	4.124 ± 1.522 (n = 5)	3.2 ± 0.295 (n = 5)	-
7	+0.003	3.037 ± 0.181 (n = 5)	3.034 ± 0.089 (n = 5)	-
11	-0.072	2.26 ± 0.059 (n = 5)	2.332 ± 0.097 (n = 5)	-
14	+0.395	2.519 ± 0.529 (n = 5)	2.124 ± 0.312 (n = 5)	-

n represents the number of samplings in each group.

The significant difference means the probability that the difference in means between the two groups is caused by coincidence due to sampling error, and 5% is used as the significance level.