Merge branch 'update-readme' into 'develop'

Fix dead links in README.md and add note about new docs site

See merge request pleroma/pleroma!1000

README.md

 # Pleroma
 
+**Note**: This readme as well as complete documentation is also availible at <https://docs-develop.pleroma.social>
+
 ## About Pleroma
 
 Pleroma is a microblogging server software that can federate (= exchange messages with) other servers that support the same federation standards (OStatus and ActivityPub). What that means is that you can host a server for yourself or your friends and stay in control of your online identity, but still exchange messages with people on larger servers. Pleroma will federate with all servers that implement either OStatus or ActivityPub, like Friendica, GNU Social, Hubzilla, Mastodon, Misskey, Peertube, and Pixelfed.
@@ -8,7 +10,7 @@ Pleroma is written in Elixir, high-performance and can run on small devices like
 
 For clients it supports both the [GNU Social API with Qvitter extensions](https://twitter-api.readthedocs.io/en/latest/index.html) and the [Mastodon client API](https://github.com/tootsuite/documentation/blob/master/Using-the-API/API.md).
 
-- [Client Applications for Pleroma](docs/Clients.md)
+- [Client Applications for Pleroma](https://docs-develop.pleroma.social/clients.html)
 
 No release has been made yet, but several servers have been online for months already. If you want to run your own server, feel free to contact us at @lain@pleroma.soykaf.com or in our dev chat at #pleroma on freenode or via matrix at <https://matrix.heldscal.la/#/room/#freenode_#pleroma:matrix.org>.
 
@@ -28,7 +30,7 @@ While we don’t provide docker files, other people have written very good ones.
 
 * Run `mix deps.get` to install elixir dependencies.
 * Run `mix pleroma.instance gen`. This will ask you questions about your instance and generate a configuration file in `config/generated_config.exs`. Check that and copy it to either `config/dev.secret.exs` or `config/prod.secret.exs`. It will also create a `config/setup_db.psql`, which you should run as the PostgreSQL superuser (i.e., `sudo -u postgres psql -f config/setup_db.psql`). It will create the database, user, and password you gave `mix pleroma.gen.instance` earlier, as well as set up the necessary extensions in the database. PostgreSQL superuser privileges are only needed for this step.
-* For these next steps, the default will be to run pleroma using the dev configuration file, `config/dev.secret.exs`. To run them using the prod config file, prefix each command at the shell with `MIX_ENV=prod`. For example: `MIX_ENV=prod mix phx.server`. Documentation for the config can be found at [`docs/config.md`](docs/config.md) in the repository, or at the "Configuration" page on <https://docs.pleroma.social>
+* For these next steps, the default will be to run pleroma using the dev configuration file, `config/dev.secret.exs`. To run them using the prod config file, prefix each command at the shell with `MIX_ENV=prod`. For example: `MIX_ENV=prod mix phx.server`. Documentation for the config can be found at [`docs/config.md`](docs/config.md) in the repository, or at the "Configuration" page on <https://docs-develop.pleroma.social/config.html>
 * Run `mix ecto.migrate` to run the database migrations. You will have to do this again after certain updates.
 * You can check if your instance is configured correctly by running it with `mix phx.server` and checking the instance info endpoint at `/api/v1/instance`. If it shows your uri, name and email correctly, you are configured correctly. If it shows something like `localhost:4000`, your configuration is probably wrong, unless you are running a local development setup.
 * The common and convenient way for adding HTTPS is by using Nginx as a reverse proxy. You can look at example Nginx configuration in `installation/pleroma.nginx`. If you need TLS/SSL certificates for HTTPS, you can look get some for free with letsencrypt: <https://letsencrypt.org/>. The simplest way to obtain and install a certificate is to use [Certbot.](https://certbot.eff.org) Depending on your specific setup, certbot may be able to get a certificate and configure your web server automatically.
@@ -66,7 +68,7 @@ This is useful for running Pleroma inside Tor or I2P.
 
 ## Customization and contribution
 
-The [Pleroma Wiki](https://git.pleroma.social/pleroma/pleroma/wikis/home) offers manuals and guides on how to further customize your instance to your liking and how you can contribute to the project.
+The [Pleroma Documentation](https://docs-develop.pleroma.social/readme.html) offers manuals and guides on how to further customize your instance to your liking and how you can contribute to the project.
 
 ## Troubleshooting