Fix HAOS compatibility and update documentation

config.yaml

@@ -1,12 +1,10 @@
 name: Folding@home
-version: 0.8.0
+version: 0.8.1
 slug: foldingathome
 description: Run Folding@home to contribute to scientific research
 url: https://gitea.bitfire.work/retr0/dont-stop-folding
 arch:
   - amd64
-  - armhf
-  - armv7
   - aarch64
 init: false
 ports:
@@ -23,7 +21,7 @@ options:
   account_token: ""
   machine_name: ""
 environment:
-  USER: "{user}"
+  FAH_USER: "{user}"
   TEAM: "{team}"
   PASSKEY: "{passkey}"
   POWER: "{power}"
@@ -35,4 +33,4 @@ schema:
   passkey: str?
   power: list(light|medium|full)
   account_token: str?
-  machine_name: str?
+  machine_name: str?