[Snyk] Security upgrade gatsby from 0.12.48 to 2.0.0

[olegnn]

Snyk has created this PR to fix 14 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Incomplete List of Disallowed Inputs SNYK-JS-BABELTRAVERSE-5962463	786
	Regular Expression Denial of Service (ReDoS) SNYK-JS-ANSIREGEX-1583908	696
	Uncontrolled resource consumption SNYK-JS-BRACES-6838727	696
	Regular Expression Denial of Service (ReDoS) SNYK-JS-SEMVER-3247795	696
	Prototype Pollution SNYK-JS-MERGE-1042987	686
	Server-side Request Forgery (SSRF) SNYK-JS-REQUEST-3361831	646
	Prototype Pollution SNYK-JS-TOUGHCOOKIE-5672873	646
	Prototype Pollution SNYK-JS-JSON5-3182856	641
	Missing Release of Resource after Effective Lifetime SNYK-JS-INFLIGHT-6095116	631
	Prototype Pollution SNYK-JS-MERGE-1040469	589
	Inefficient Regular Expression Complexity SNYK-JS-MICROMATCH-6838728	589
	Prototype Pollution SNYK-JS-UNSETVALUE-2400660	589
	Regular Expression Denial of Service (ReDoS) npm:braces:20180219	506
	Regular Expression Denial of Service (ReDoS) SNYK-JS-UGLIFYJS-1727251	479

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• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Regular Expression Denial of Service (ReDoS)
🦉 Prototype Pollution
🦉 Server-side Request Forgery (SSRF)