chore: rename the default name to main (italia#1399)

.github/PULL_REQUEST_TEMPLATE.md

@@ -12,7 +12,7 @@ In particular, the ...
 ## Checklist
 <!--- Please insert and `x` when each of the following steps is done -->
 
-* [ ] I followed the indications in [CONTRIBUTING.md](https://github.com/italia/developers.italia.it/blob/master/CONTRIBUTING.md)
+* [ ] I followed the indications in [CONTRIBUTING.md](https://github.com/italia/developers.italia.it/blob/main/CONTRIBUTING.md)
 * [ ] The documentation related to the proposed change has been updated accordingly (also comments in code).
 * [ ] Have you written new tests for your core changes, as applicable?
 * [ ] Have you successfully ran tests with your changes locally?

.github/workflows/publish.yml

@@ -2,7 +2,7 @@ on:
   schedule:
     - cron: '0 6 * * *'
   push:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
   publish:

CONTRIBUTING.md

@@ -39,7 +39,7 @@ That's great and always appreciated! :sunglasses:
 
 2. Follow our [conventions regarding commits](#commit-messages) for your commit message
 
-3. Open a Pull request against `master`.
+3. Open a Pull request against `main`.
    Blank PRs have a template you can follow where you can tick a checklist.
    When each one of the step is done, please insert an `x` in between the `[ ]`
    to mark it as ready.
@@ -70,8 +70,8 @@ If a commit fixes an issue, please
 
 This repository adopts a simplified branch management system as follows:
 
-* `master` is stable and gets deployed automatically. Never push directly to it;
-* feature or fix branches are derived directly from master.
+* `main` is stable and gets deployed automatically. Never push directly to it;
+* feature or fix branches are derived directly from `main`.
 
 ### Releases