Merge pull request #1389 from shaarli/doc-rework-setup

doc: rework installation/setup guides, general refactoring

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+# Versioning
+
+If you're maintaining a 3rd party tool for Shaarli (theme, plugin, etc.), It's important to understand how Shaarli branches work ensure your tool stays compatible.
+
+
+## `master` branch
+
+The `master` branch is the development branch. Any new change MUST go through this branch using Pull Requests.
+
+Remarks:
+
+- This branch shouldn't be used for production as it isn't necessary stable.
+- 3rd party aren't required to be compatible with the latest changes.
+- Official plugins, themes and libraries (contained within Shaarli organization repos) must be compatible with the master branch.
+
+
+## `v0.x` branch
+
+The `v0.x` branch points to the latest `v0.x.y` release.
+
+If a major bug affects the original `v0.x.0` release, we may [backport](https://en.wikipedia.org/wiki/Backporting) a fix for this bug from master, to the `v0.x` branch, and create a new bugfix release (eg. `v0.x.1`) from this branch.
+
+This allows users of the original release to upgrade to the fixed version, without having to upgrade to a completely new minor/major release.
+
+
+## `latest` branch
+
+This branch point the latest release. It recommended to use it to get the latest tested changes.
+
+
+## Releases
+
+For every release, we manually generate a .zip file which contains all Shaarli dependencies, making Shaarli's installation only one step.
+
+
+## Advices on 3rd party git repos workflow
+
+### Versioning
+
+Any time a new Shaarli release is published, you should publish a new release of your repo if the changes affected you since the latest release (take a look at the [changelog](https://github.com/shaarli/Shaarli/releases) (*Draft* means not released yet) and the commit log (like [`tpl` folder](https://github.com/shaarli/Shaarli/commits/master/tpl/default) for themes)). You can either:
+
+   - use the Shaarli version number, with your repo version. For example, if Shaarli `v0.8.3` is released, publish a `v0.8.3-1` release, where `v0.8.3` states Shaarli compatibility and `-1` is your own version digit for the current Shaarli version.
+   - use your own versioning scheme, and state Shaarli compatibility in the release description.
+
+Using this, any user will be able to pick the release matching his own Shaarli version.
+
+### Major bugfix backport releases
+
+To be able to support backported fixes, it recommended to use our workflow:
+
+```bash
+# In master, fix the major bug
+git commit -m "Katastrophe"
+git push origin master
+# Get your commit hash
+git log --format="%H" -n 1
+# Create a new branch from your latest release, let's say v0.8.2-1 (the tag name)
+git checkout -b katastrophe v0.8.2-1
+# Backport the fix commit to your brand new branch
+git cherry-pick <fix commit hash>
+git push origin katastrophe
+# Then you just have to make a new release from the `katastrophe` branch tagged `v0.8.3-1`
+```