[topunix]

Part 1 of Bug 1849943 (docs still based on BMO instead of Harmony).

What

• installing/apache.rst: replaces the TODO stub with reverse proxy instructions. Covers enabling mod_proxy/mod_proxy_http/mod_headers, a virtual host example, Debian/Ubuntu and Fedora/Red Hat paths, and the X-Forwarded-Proto header for TLS termination.
• installing/nginx.rst: new file. web_server.rst already listed nginx in its toctree but the page didn't exist, which caused a Sphinx build warning.

Both pages match the existing Caddy page: proxy to 127.0.0.1:3001, and run the app with MOJO_REVERSE_PROXY=1.

Notes

• Port 3001 comes from bugzilla.pl (MOJO_LISTEN default). Both pages mention the PORT override.
• The Apache page uses a site/conf.d file and never touches the main httpd.conf.
• The Nginx page calls out client_max_body_size. Nginx defaults to 1 MB, which would silently block larger attachment uploads.

Testing

Built locally with the pinned versions in docs/requirements.txt (full rebuild, sphinx-build -E). Both pages render. The nginx toctree warning is gone. Remaining warnings are pre-existing: the extension glob patterns (staged by makedocs.pl, not by plain sphinx-build) and two in integrating/auth-delegation.rst, which the next PR fixes.

Still to come on 1849943

A separate PR removing BMO-specific references across the docs (BMO test server links, example hostnames, dead mozilla.org links) and the remaining mod_perl instructions in the platform install pages.