Add "Install Server" button to VSCode extension #58

Job	Run time
Test - stable toolchain	1m 16s
Check WASM	35s
Prepare	6s
Docs - stable toolchain (recent)	53s
Test - MSRV	1m 22s
Test - nightly toolchain	1m 21s
Check Fuzz	51s
Docs - nightly toolchain (recent)	1m 14s
Lint - nightly toolchain (recent)	46s
Format - nightly toolchain	18s
	8m 42s

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