README: remove outdated information

* Links in the top row point to some very old blog posts and to the
  devices wiki page. Remove them, the first line has a link to
  postmarketos.org where the user should be able to get all relevant
  information about postmarketOS if they don't know this project.

* "Package build scripts live in the pmaports repository now.", this
  was useful shortly after we made the change, but it has been like this
  for years now. Again, the postmarketOS homepage lists where other
  related source code is, in case the user doesn't know.

* 2 GB of RAM recommened for compiling: this was a rule of thumb for
  when all postmarketOS packages had to be compiled from source. This is
  not the case anymore, we have a binary repository. Depending on which
  package you want to compile, you don't need as much RAM. And some
  users who just want to run 'pmbootstrap install' don't need to build
  anything at all. I think this is more confusing than helpful, so
  remove it.

* Kernels based on grsec patchset are not supported. I don't think
  anyone will try this, this was more relevant when the patchset was
  still distributed freely and you could actually use it in Alpine
  Linux (by default even?) and Arch Linux. An artefact of the past.
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Oliver Smith 2022-10-25 21:49:29 +02:00
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# pmbootstrap
[**Introduction**](https://postmarketos.org/blog/2017/05/26/intro/) | [**Security Warning**](https://ollieparanoid.github.io/post/security-warning/) | [**Devices**](https://wiki.postmarketos.org/wiki/Devices)
Sophisticated chroot/build/flash tool to develop and install [postmarketOS](https://postmarketos.org).
Package build scripts live in the [`pmaports`](https://gitlab.com/postmarketOS/pmaports) repository now.
## Requirements
* 2 GB of RAM recommended for compiling
* Linux distribution on the host system (`x86`, `x86_64`, or `aarch64`)
* [Windows subsystem for Linux (WSL)](https://en.wikipedia.org/wiki/Windows_Subsystem_for_Linux) does **not** work! Please use [VirtualBox](https://www.virtualbox.org/) instead.
* Kernels based on the grsec patchset [do **not** work](https://github.com/postmarketOS/pmbootstrap/issues/107)
* [Linux kernel 3.17 or higher](https://postmarketos.org/oldkernel)
* Python 3.6+
* OpenSSL