add app_url and footnote

Author: svenvg93

getting-started/installation/using-docker-compose.md

@@ -70,8 +70,8 @@ You will need to get your user's `PUID` and `PGID`, you can do this by running `
         environment:
             - PUID=
             - PGID=
-            - APP_KEY= # Required
-            - APP_URL= # Required
+            - <a data-footnote-ref href="#user-content-fn-1">APP_KEY</a> # Required
+            - <a data-footnote-ref href="#user-content-fn-2">APP_URL</a>= # Required
             - DB_CONNECTION=mariadb
             - DB_HOST=db
             - DB_PORT=3306
@@ -116,8 +116,8 @@ services:
         environment:
             - PUID=
             - PGID=
-            - APP_KEY= # Required
-            - APP_URL= # Required
+            - <a data-footnote-ref href="#user-content-fn-1">APP_KEY</a> # Required
+            - <a data-footnote-ref href="#user-content-fn-2">APP_URL</a>= # Required
             - DB_CONNECTION=mysql
             - DB_HOST=db
             - DB_PORT=3306
@@ -162,8 +162,8 @@ services:
         environment:
             - PUID=
             - PGID=
-            - APP_KEY= # Required
-            - APP_URL= # Required
+            - <a data-footnote-ref href="#user-content-fn-1">APP_KEY</a> # Required
+            - <a data-footnote-ref href="#user-content-fn-2">APP_URL</a>= # Required
             - DB_CONNECTION=pgsql
             - DB_HOST=db
             - DB_PORT=5432

getting-started/installation/using-docker.md

@@ -59,7 +59,8 @@ docker run -d --name speedtest-tracker --restart unless-stopped \
     -p 8443:443 \
     -e PUID= \
     -e PGID= \
-    -e APP_KEY= \
+    -e <a data-footnote-ref href="#user-content-fn-1">APP_KEY</a>= \
+    -e <a data-footnote-ref href="#user-content-fn-2">APP_URL</a>= \
     -e DB_CONNECTION=mariadb \
     -e DB_HOST= \
     -e DB_PORT=3306 \
@@ -79,7 +80,8 @@ docker run -d --name speedtest-tracker --restart unless-stopped \
     -p 8443:443 \
     -e PUID= \
     -e PGID= \
-    -e APP_KEY= \
+    -e <a data-footnote-ref href="#user-content-fn-1">APP_KEY</a>= \
+    -e <a data-footnote-ref href="#user-content-fn-2">APP_URL</a>= \
     -e DB_CONNECTION=mysql \
     -e DB_HOST= \
     -e DB_PORT=3306 \
@@ -99,7 +101,8 @@ docker run -d --name speedtest-tracker --restart unless-stopped \
     -p 8443:443 \
     -e PUID=1000 \
     -e PGID=1000 \
-    -e APP_KEY=
+    -e <a data-footnote-ref href="#user-content-fn-1">APP_KEY</a>= \
+    -e <a data-footnote-ref href="#user-content-fn-2">APP_URL</a>= \
     -e DB_CONNECTION=pgsql \
     -e DB_HOST= \
     -e DB_PORT=5432 \