Update install from source instructions

[Karitham]

From go 1.18 onwards (https://tip.golang.org/doc/go1.18#tools), to install a package from source, we MUST use go install.
Since the command is already available before (from 1.16 onwards) and it's the recommended way to install a package, why not use it?

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All committers have signed the CLA.

[na--]

Thanks!

[codecov-commenter]

Codecov Report

Merging #2359 (dedf44a) into master (42f2e60) will increase coverage by 1.89%.
The diff coverage is 79.70%.

❗ Current head dedf44a differs from pull request most recent head 97f1c73. Consider uploading reports for the commit 97f1c73 to get more accurate results

@@            Coverage Diff             @@
##           master    #2359      +/-   ##
==========================================
+ Coverage   72.71%   74.61%   +1.89%     
==========================================
  Files         184      188       +4     
  Lines       14571    15124     +553     
==========================================
+ Hits        10596    11285     +689     
+ Misses       3333     3154     -179     
- Partials      642      685      +43     

Flag	Coverage Δ
ubuntu	74.47% <79.63%> (+1.82%)	⬆️
windows	74.19% <79.70%> (+1.82%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
api/v1/client/client.go	0.00% <0.00%> (ø)
api/v1/client/metrics.go	0.00% <0.00%> (ø)
api/v1/client/status.go	0.00% <0.00%> (ø)
api/v1/group.go	31.25% <ø> (-57.82%)	⬇️
api/v1/metric.go	68.00% <ø> (-32.00%)	⬇️
api/v1/routes.go	55.31% <ø> (ø)
api/v1/status.go	75.00% <ø> (-25.00%)	⬇️
cmd/archive.go	11.76% <0.00%> (+0.65%)	⬆️
cmd/cloud.go	4.76% <0.00%> (+0.04%)	⬆️
cmd/inspect.go	0.00% <0.00%> (ø)
... and 121 more

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[olegbespalov]

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