docs: Document HTTP proxy configuration for Edge Proxy

[rolodato]

See Flagsmith/edge-proxy#134

Changes can be seen at https://docs-git-docs-edge-proxy-http-proxy-flagsmith.vercel.app/deployment/hosting/locally-edge-proxy#environment-variables

Confirmed with:

% cat tinyproxy.conf
Port 8889
Timeout 600
Listen 0.0.0.0

% tinyproxy -d -c tinyproxy.conf

% docker run \
    -e ALL_PROXY="host.docker.internal:8889" \
    -p 8000:8000 \
    flagsmith/edge-proxy:latest

Result:

CONNECT   Dec 18 13:22:25.809 [22667]: Connect (file descriptor 4): 127.0.0.1
CONNECT   Dec 18 13:22:25.809 [22667]: Request (file descriptor 4): CONNECT edge.api.flagsmith.com:443 HTTP/1.1
INFO      Dec 18 13:22:25.809 [22667]: No upstream proxy for edge.api.flagsmith.com
INFO      Dec 18 13:22:25.809 [22667]: opensock: opening connection to edge.api.flagsmith.com:443
INFO      Dec 18 13:22:25.817 [22667]: opensock: getaddrinfo returned for edge.api.flagsmith.com:443
CONNECT   Dec 18 13:22:25.823 [22667]: Established connection to host "edge.api.flagsmith.com" using file descriptor 8.
INFO      Dec 18 13:22:25.823 [22667]: Not sending client headers to remote machine
INFO      Dec 18 13:22:27.485 [22667]: Closed connection between local client (fd:4) and remote client (fd:8)

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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4928	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4928	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4928	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4928	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4928	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4928	Finished ✅	Results ✅

[github-actions]

Uffizzi Ephemeral Environment deployment-59251

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/4928

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[matthewelwell]

@rolodato now that #4932 is merged, can you rebase your PR onto main? That should get CI passing.