Remove documentation from integration readme

[bmorelli25]

Summary

I could use some second opinions on this one. This PR removes almost all of the documentation from the APM package readme. What's left is a brief overview of APM and a field reference. In addition, there are three links to APM documentation:

• APM Components
• APM quick start
• APM data streams

Closes elastic/observability-docs#2008.

[mergify]

This pull request does not have a backport label. Could you fix it @bmorelli25? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-7.x is the label to automatically backport to the 7.x branch.
• backport-7./d is the label to automatically backport to the 7./d branch. /d is the digit

NOTE: backport-skip has been added to this pull request.

[apmmachine]

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• Start Time: 2023-01-09T22:16:00.224+0000

• Duration: 10 min 55 sec

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[apmmachine]

📚 Go benchmark report

Diff with the main branch

name                                          old time/op    new time/op    delta
pkg:github.com/elastic/apm-server/internal/agentcfg goos:linux goarch:amd64
FetchAndAdd/FetchFromCache-12                   41.2ns ± 0%    46.2ns ± 0%   +12.20%  (p=0.016 n=4+5)
FetchAndAdd/FetchAndAddToCache-12               95.5ns ± 2%   102.1ns ± 0%    +6.83%  (p=0.008 n=5+5)
pkg:github.com/elastic/apm-server/internal/beater/request goos:linux goarch:amd64
ContextReset/Remote_Addr_ipv4-12                 767ns ±13%     657ns ±15%   -14.34%  (p=0.016 n=5+5)
ContextReset/X-Forwarded-For_ipv6-12             937ns ±16%     645ns ±36%   -31.11%  (p=0.016 n=5+5)
ContextResetContentEncoding/empty-12             110ns ± 1%     123ns ± 0%   +11.88%  (p=0.008 n=5+5)
ContextResetContentEncoding/uncompressed-12      130ns ± 1%     145ns ± 1%   +12.23%  (p=0.008 n=5+5)
pkg:github.com/elastic/apm-server/internal/publish goos:linux goarch:amd64
Publisher-12                                     1.00s ± 0%     1.00s ± 0%    -0.03%  (p=0.016 n=4+5)
pkg:github.com/elastic/apm-server/x-pack/apm-server/aggregation/spanmetrics goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/aggregation/txmetrics goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/sampling goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/sampling/eventstorage goos:linux goarch:amd64
WriteTransaction/json_codec-12                  4.67µs ±18%   11.20µs ±46%  +139.92%  (p=0.008 n=5+5)
WriteTransaction/json_codec_big_tx-12           4.95µs ± 4%   12.37µs ±53%  +149.98%  (p=0.008 n=5+5)
ReadEvents/json_codec/0_events-12                321ns ± 6%     363ns ± 3%   +13.14%  (p=0.008 n=5+5)
ReadEvents/json_codec_big_tx/0_events-12         308ns ± 6%     355ns ± 9%   +15.22%  (p=0.008 n=5+5)
ReadEvents/json_codec_big_tx/1_events-12        11.5µs ± 9%    12.4µs ± 3%    +7.81%  (p=0.032 n=5+5)
ReadEvents/nop_codec/0_events-12                 306ns ± 5%     344ns ± 5%   +12.13%  (p=0.008 n=5+5)
ReadEvents/nop_codec/1_events-12                1.99µs ± 4%    2.13µs ± 4%    +7.35%  (p=0.032 n=5+4)
ReadEvents/nop_codec/1000_events-12              897µs ± 5%     983µs ±13%    +9.63%  (p=0.032 n=5+5)
ReadEvents/nop_codec_big_tx/1_events-12         1.95µs ± 8%    2.21µs ± 9%   +13.11%  (p=0.016 n=5+5)
IsTraceSampled/sampled-12                       69.7ns ± 3%    77.4ns ± 3%   +11.12%  (p=0.008 n=5+5)
IsTraceSampled/unsampled-12                     71.3ns ± 2%    79.3ns ± 1%   +11.22%  (p=0.008 n=5+5)
IsTraceSampled/unknown-12                        370ns ± 1%     422ns ± 2%   +13.91%  (p=0.008 n=5+5)

name                                          old alloc/op   new alloc/op   delta
pkg:github.com/elastic/apm-server/internal/agentcfg goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/beater/request goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/publish goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/aggregation/spanmetrics goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/aggregation/txmetrics goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/sampling goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/sampling/eventstorage goos:linux goarch:amd64
ReadEvents/json_codec_big_tx/100_events-12      1.03MB ± 0%    1.03MB ± 0%    +0.06%  (p=0.016 n=5+5)
ReadEvents/nop_codec/1000_events-12             2.18MB ± 0%    2.19MB ± 1%    +0.54%  (p=0.032 n=5+5)

name                                          old allocs/op  new allocs/op  delta
pkg:github.com/elastic/apm-server/internal/agentcfg goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/beater/request goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/internal/publish goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/aggregation/spanmetrics goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/aggregation/txmetrics goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/sampling goos:linux goarch:amd64
pkg:github.com/elastic/apm-server/x-pack/apm-server/sampling/eventstorage goos:linux goarch:amd64

report generated with https://pkg.go.dev/golang.org/x/perf/cmd/benchstat

[simitt]

LGTM