Update config docs

source/environment.html.md

@@ -13,7 +13,6 @@ Here are the variables that Plume uses:
 - `BASE_URL`: the domain name, or IP and port on which Plume is listening. It is used in all federation-related code.
 - `DATABASE_URL`: the URL of the PostgreSQL database, used by Plume (`postgres://plume:plume@localhost/plume` by default with PostgreSQL, `plume.db` with SQlite).
 - `MIGRATION_DIRECTORY`: The folder that stores the migration files for the database, migrations/postgres for PostgreSQL database or migrations/sqlite for SQlite database.
-- `USE_HTTPS`: if it is `0`, federation and medias will be using HTTP by default (`1` by default).
 - `ROCKET_ADDRESS`: the adress on which Plume should listen (`0.0.0.0` by default).
 - `ROCKET_PORT`: the port on which Plume should listen ([`7878` by default](https://twitter.com/ag_dubs/status/852559264510070784))
 - `ROCKET_SECRET_KEY`: key used to sign private cookies and for CSRF protection. If it is not set, it will be regenerated everytime you restart Plume,
@@ -26,7 +25,33 @@ The SMTP server to send mails can be configured with:
 - `MAIL_PASSWORD`: its password.
 - `MAIL_HELO_NAME`: the name sent during EHLO/HELO.
 
+You can also change the logo you want to use for your instance in this file. Your logo should be in the `static` directory.
+To make Plume load it, you can use:
+
+- `PLUME_LOGO`: it will change the logo in the header, the favicon, and the webmanifest (used when pinning a website
+to home screen on mobile phones). It is recommended to use SVG files when possible.
+- `PLUME_LOGO_FAVICON`: that can change the favicon, if you want to use an image that is not `PLUME_LOGO`.
+- `PLUME_LOGO_size`: where `size` is one of 48, 72, 96, 144, 160, 192, 256 or 512. It will change the icon to use
+in the webmanifest for the given size. You can of course specify it multiple times, with different sizes.
+
+All the specified paths should be relative to the `static` directory.
+
+Here is an example, that will make your instance use the "paragraphs" logo.
+
+```bash
+PLUME_LOGO=icons/trwnh/paragraphs/plumeParagraphs.svg
+PLUME_LOGO_FAVICON=icons/trwnh/paragraphs/plumeParagraphs32.png
+PLUME_LOGO_48=icons/trwnh/paragraphs/plumeParagraphs48.png
+PLUME_LOGO_72=icons/trwnh/paragraphs/plumeParagraphs72.png
+PLUME_LOGO_96=icons/trwnh/paragraphs/plumeParagraphs96.png
+PLUME_LOGO_144=icons/trwnh/paragraphs/plumeParagraphs144.png
+PLUME_LOGO_160=icons/trwnh/paragraphs/plumeParagraphs160.png
+PLUME_LOGO_192=icons/trwnh/paragraphs/plumeParagraphs192.png
+PLUME_LOGO_256=icons/trwnh/paragraphs/plumeParagraphs256.png
+PLUME_LOGO_512=icons/trwnh/paragraphs/plumeParagraphs512.png
+```
+
 ## Diesel
 
 Diesel, the tool we use to run migrations may be configured with the `DATABASE_URL` which should contain the URL of the
-PostgreSQL database. Otherwise, you can specify `--database-url YOUR-URL` everytime you run a `diesel` command.
+PostgreSQL database, or the path to the SQLite file. Otherwise, you can specify `--database-url YOUR-URL` everytime you run a `diesel` command.