Bug 1599080 - Integrate the devtools doc in https://firefox-source-docs.mozilla.org/ r=nchevobbe

Differential Revision: https://phabricator.services.mozilla.com/D54515

--HG--
extra : moz-landing-system : lando

devtools/moz.build

@@ -47,3 +47,5 @@ with Files('docs/tools/http-inspector.md'):
 
 with Files('docs/tools/inspector-panel.md'):
     BUG_COMPONENT = ('DevTools', 'Inspector')
+
+SPHINX_TREES['/devtools'] = 'docs'

tools/docs/config.yml

@@ -7,13 +7,14 @@ categories:
         - browser
         - dom
         - gfx
+        - devtools
         - toolkit
+        - js
         - dom/bindings/webidl
         - modules/libpref
         - remote
         - services/common/services
         - uriloader
-        - js
     build_doc:
         - mach
         - tools/try