Slight improvements for admin docs (#856)

* admin/install: simplify system package instructions & use sh codeblocks

No need to assume bash

* admin/config: document RAILS_ENV in more detail

content/en/admin/config.md

@@ -85,7 +85,9 @@ Generate with `rake mastodon:webpush:generate_vapid_key`. Changing it will break
 
 #### `RAILS_ENV`
 
-Environment. Can be `production`, `development`, or `test`. If you are running Mastodon on your personal computer for development purposes, use `development`. That is also the default. If you are running Mastodon online, use `production`. Mastodon will load different configuration defaults based on the environment.
+Which Rails environment is loaded from `config/environments`. Can be `production`, `development`, or `test`.
+If you are running Mastodon on your personal computer for development purposes, use `development`, which will disable caching. This is also the default.
+If you are running Mastodon online, use `production`.
 
 {{< hint style="warning" >}}
 This variable cannot be defined in dotenv (`.env`) files as it's used before they are loaded.

content/en/admin/install.md

@@ -13,31 +13,16 @@ menu:
 * A **domain name** \(or a subdomain\) for the Mastodon server, e.g. `example.com`
 * An e-mail delivery service or other **SMTP server**
 
-You will be running the commands as root. If you aren’t already root, switch to root:
+The following commands should be run as root. If you aren’t already root, switch via `su`.
 
 ### System repositories {#system-repositories}
 
-Make sure curl is installed first:
-
-#### Node.js {#node-js}
-
-```bash
-curl -sL https://deb.nodesource.com/setup_12.x | bash -
-```
-
-#### Yarn {#yarn}
-
-```bash
-curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
-echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
-```
-
 ### System packages {#system-packages}
 
-```bash
+```sh
 apt update
 apt install -y \
-  imagemagick ffmpeg libpq-dev libxml2-dev libxslt1-dev file git-core \
+  curl imagemagick ffmpeg libpq-dev libxml2-dev libxslt1-dev file git-core \
   g++ libprotobuf-dev protobuf-compiler pkg-config nodejs gcc autoconf \
   bison build-essential libssl-dev libyaml-dev libreadline6-dev \
   zlib1g-dev libncurses5-dev libffi-dev libgdbm-dev \
@@ -45,23 +30,36 @@ apt install -y \
   certbot python-certbot-nginx yarn libidn11-dev libicu-dev libjemalloc-dev
 ```
 
+#### Node.js {#node-js}
+
+```sh
+curl -sL https://deb.nodesource.com/setup_12.x | bash -
+```
+
+#### Yarn {#yarn}
+
+```sh
+curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
+echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
+```
+
 ### Installing Ruby {#installing-ruby}
 
 We will be using rbenv to manage Ruby versions, because it’s easier to get the right versions and to update once a newer release comes out. rbenv must be installed for a single Linux user, therefore, first we must create the user Mastodon will be running as:
 
-```bash
+```sh
 adduser --disabled-login mastodon
 ```
 
 We can then switch to the user:
 
-```bash
+```sh
 su - mastodon
 ```
 
 And proceed to install rbenv and rbenv-build:
 
-```bash
+```sh
 git clone https://github.com/rbenv/rbenv.git ~/.rbenv
 cd ~/.rbenv && src/configure && make -C src
 echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
@@ -72,20 +70,20 @@ git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
 
 Once this is done, we can install the correct Ruby version:
 
-```bash
+```sh
 RUBY_CONFIGURE_OPTS=--with-jemalloc rbenv install 2.7.2
 rbenv global 2.7.2
 ```
 
 We’ll also need to install bundler:
 
-```bash
+```sh
 gem install bundler --no-document
 ```
 
 Return to the root user:
 
-```bash
+```sh
 exit
 ```
 
@@ -103,7 +101,7 @@ You will need to create a PostgreSQL user that Mastodon could use. It is easiest
 
 Open the prompt:
 
-```bash
+```sh
 sudo -u postgres psql
 ```
 
@@ -120,7 +118,7 @@ Done!
 
 It is time to download the Mastodon code. Switch to the mastodon user:
 
-```bash
+```sh
 su - mastodon
 ```
 
@@ -128,7 +126,7 @@ su - mastodon
 
 Use git to download the latest stable release of Mastodon:
 
-```bash
+```sh
 git clone https://github.com/tootsuite/mastodon.git live && cd live
 git checkout $(git tag -l | grep -v 'rc[0-9]*$' | sort -V | tail -n 1)
 ```
@@ -137,7 +135,7 @@ git checkout $(git tag -l | grep -v 'rc[0-9]*$' | sort -V | tail -n 1)
 
 Now to install Ruby and JavaScript dependencies:
 
-```bash
+```sh
 bundle config deployment 'true'
 bundle config without 'development test'
 bundle install -j$(getconf _NPROCESSORS_ONLN)
@@ -152,7 +150,7 @@ The two `bundle config` commands are only needed the first time you're installin
 
 Run the interactive setup wizard:
 
-```bash
+```sh
 RAILS_ENV=production bundle exec rake mastodon:setup
 ```
 
@@ -166,7 +164,7 @@ The configuration file is saved as `.env.production`. You can review and edit it
 
 You’re done with the mastodon user for now, so switch back to root:
 
-```bash
+```sh
 exit
 ```
 
@@ -174,7 +172,7 @@ exit
 
 Copy the configuration template for nginx from the Mastodon directory:
 
-```bash
+```sh
 cp /home/mastodon/live/dist/nginx.conf /etc/nginx/sites-available/mastodon
 ln -s /etc/nginx/sites-available/mastodon /etc/nginx/sites-enabled/mastodon
 ```
@@ -187,7 +185,7 @@ Reload nginx for the changes to take effect:
 
 We’ll use Let’s Encrypt to get a free SSL certificate:
 
-```bash
+```sh
 certbot --nginx -d example.com
 ```