Feature/1273 rate limiting redis

[happyRip]

Summary

Closes #1273

Screenshots

Changes

• Add section regarding rate limiting providers
• Remove duplicate of rate limiting configuration example

Notes for Reviewers

nil

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Run Locally: Verified that the docs build using make server, posted screenshots, verified external links. Test with HUGO_PARAMS_SEARCH_ENABLED=true if style changes will affect the search bar.
• New Features Marked: Documentation for new features is marked using the new-in-version shortcode, according to the guidelines in CONTRIBUTING.
• Style Guidelines: Documentation obeys style guidelines in CONTRIBUTING.
• Commits: Commit messages follow guidelines in CONTRIBUTING, there are no fixup commits left.

[nejraselimovic]

do you set the provider along with profiles or?

[happyRip]

Yes, provider is one of the possible options for rate-limiting, so you can use

rate-limiting:
  provider: ...
  profiles:
    - ...
    - ...

but the same example (that was removed) is available at

lorawan-stack-docs/doc/content/reference/rate-limiting/_index.md

Lines 20 to 62 in bc93dbb

	```yaml
	rate-limiting:
	profiles:
	- name: HTTP servers
	max-per-min: 30
	associations:
	- http
	- name: User login
	max-per-min: 10
	associations:
	- http:account
	- name: Create new users
	max-per-min: 10
	associations:
	- grpc:method:/ttn.lorawan.v3.UserRegistry/Create
	- name: Application downlink traffic
	max-per-min: 10
	associations:
	- as:down:web
	- as:down:mqtt
	- grpc:method:/ttn.v3.lorawan.v3.AppAs/DownlinkQueuePush
	- grpc:method:/ttn.v3.lorawan.v3.AppAs/DownlinkQueueReplace
	- name: Gateway connections
	max-per-min: 5
	associations:
	- gs:accept:mqtt
	- gs:accept:ws
	- grpc:stream:accept:/ttn.lorawan.v3.GtwGs/LinkGateway
	- name: gRPC API
	max-per-min: 60
	associations:
	- grpc:method
	- grpc:stream:accept
	- name: Override rate for uplink simulation
	max-per-min: 5
	associations:
	- grpc:method:/ttn.lorawan.v3.AppAs/SimulateUplink
	- name: Gateway uplink traffic
	max-per-min: 1000
	max-burst: 1500
	associations:
	- gs:up
	```