Fix old references to master in docs

docs/content/doc/development/development.md

@@ -15,7 +15,7 @@ menu:
 We use go modules to vendor libraries for Vikunja, so you'll need at least go `1.11` to use these.
 If you don't intend to add new dependencies, go `1.9` and above should be fine.
 
-To contribute to Vikunja, fork the project and work on the master branch.
+To contribute to Vikunja, fork the project and work on the main branch.
 
 A lot of developing tasks are automated using a Magefile, so make sure to [take a look at it]({{< ref "mage.md">}}).
 

docs/content/doc/development/mage.md

@@ -39,7 +39,7 @@ There are multiple categories of subcommands in the magefile:
 
 ## CI
 
-These tasks are automatically run in our CI every time someone pushes to master or you update a pull request:
+These tasks are automatically run in our CI every time someone pushes to main or you update a pull request:
 
 * `mage check:lint`
 * `mage check:fmt`

docs/content/doc/development/notifications.md

@@ -110,4 +110,4 @@ If it was called, no mails are being sent and you can instead assert they have b
 
 ## Example
 
-Take a look at the [pkg/user/notifications.go](https://code.vikunja.io/api/src/branch/master/pkg/user/notifications.go) file for a good example.
+Take a look at the [pkg/user/notifications.go](https://code.vikunja.io/api/src/branch/main/pkg/user/notifications.go) file for a good example.

docs/content/doc/setup/config.md

@@ -32,7 +32,7 @@ first:
 Vikunja supports using `toml`, `yaml`, `hcl`, `ini`, `json`, envfile, env variables and Java Properties files.
 We reccomend yaml or toml, but you're free to use whatever you want.
 
-Vikunja provides a default [`config.yml`](https://kolaente.dev/vikunja/api/src/branch/master/config.yml.sample) file which you can use as a starting point.
+Vikunja provides a default [`config.yml`](https://kolaente.dev/vikunja/api/src/branch/main/config.yml.sample) file which you can use as a starting point.
 
 # Config file locations
 
@@ -46,7 +46,7 @@ Vikunja will search on various places for a config file:
 # Default configuration with explanations
 
 The following explains all possible config variables and their defaults.
-You can find a full example configuration file in [here](https://code.vikunja.io/api/src/branch/master/config.yml.sample).
+You can find a full example configuration file in [here](https://code.vikunja.io/api/src/branch/main/config.yml.sample).
 
 If you don't provide a value in your config file, their default will be used.
 
@@ -55,7 +55,7 @@ If you don't provide a value in your config file, their default will be used.
 Most config variables are nested under some "higher-level" key.
 For example, the `interface` config variable is a child of the `service` key.
 
-The docs below aim to reflect that leveling, but please also have a lookt at [the default config](https://code.vikunja.io/api/src/branch/master/config.yml.sample) file
+The docs below aim to reflect that leveling, but please also have a lookt at [the default config](https://code.vikunja.io/api/src/branch/main/config.yml.sample) file
 to better grasp how the nesting looks like.
 
 <!-- Generated config will be injected here -->

docs/content/doc/setup/install-backend.md

@@ -28,7 +28,7 @@ wget <download-url>
 ### Verify the GPG signature
 
 Starting with version `0.7`, all releases are signed using pgp.
-Releases from `master` will always be signed.
+Releases from `main` will always be signed.
 
 To validate the downloaded zip file use the signiture file `.asc` and the key `FF054DACD908493A`: