Update development documentation

docs/howtos/development_with_kds.md

@@ -0,0 +1,15 @@
+## Running Kolibri with local Kolibri Design System
+
+Kolibri uses components from [Kolibri Design System](https://github.com/learningequality/kolibri-design-system) (KDS). KDS is installed in Kolibri as a usual npm dependency.
+
+It is sometimes useful to run Kolibri development server linked to local KDS repository, for example to confirm that a KDS update fixes bug observed in Kolibri, when developing new KDS feature in support of Kolibri feature, etc.
+
+For this purpose, Kolibri provides `devserver-with-kds` command that will run the development server with Kolibri using local KDS:
+
+```bash
+yarn run devserver-with-kds <kds-path>
+```
+
+where `<kds-path>` is the path of the local `kolibri-design-system` repository.
+
+It is recommended to use an absolute KDS path as some developers observed problems when running the command with a relative path.

docs/howtos/index.rst

@@ -12,5 +12,6 @@ These guides are step by step guides for common tasks in getting started and wor
   installing_pyenv
   pyenv_virtualenv
   nodeenv
-  another_kolibri_instance
   rebasing_a_pull_request
+  another_kolibri_instance
+  development_with_kds

docs/howtos/rebasing_a_pull_request.md

@@ -1,3 +1,5 @@
+## Rebasing a Pull Request
+
 On certain occasions, it might be necessary to redirect a pull request from the develop branch to the latest release branch, such as `release-v*` (e.g., `release-v0.16.x` when working on version 0.16), or vice versa. This guide outlines the steps for rebasing a feature branch related to your pull request while maintaining a clean commit history.
 
 The demonstration centers on the process of rebasing a feature branch that is directed towards the `develop` branch in your pull request, transitioning it to the most recent release branch, identified as `release-v*`. If the need arises to rebase your pull request in the opposite direction—from `release-v*` to `develop` you can follow the same steps, just adjusting the branch names as indicated in the guide below.