[gedit] readme: big update, simplify

[Sébastien Wilmet <swilmet src gnome org>]

commit f76027bdf2f8169ed0eab22df82588ab0cb82360
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Aug 26 07:20:24 2019 +0200

    readme: big update, simplify
    
    Throughout the file: better use the Markdown syntax (GitLab renders it).
    
    In order in the diff:
    
    Intro:
    - Take the same description as in the AppData file. There is anyway more
    information on the website. To not have many different gedit
    descriptions a bit everywhere (more difficult to update at all the
    places).
    - For the programming languages used, it's explained in
      docs/gedit-development-getting-started.md.
    
    Resources:
    - all the links are available on the website.
    
    Installation:
    - Have a separate Dependencies section, and refer to the meson.build
    file, it will simplify the maintenance, to have the list of deps in only
    one place, no need to update the version numbers in both places (in the
    past the readme file was frequently outdated, so it was worse).
    - Simpler install procedure with Meson, with the 3 commands taken from:
      https://mesonbuild.com/Quick-guide.html
    - Don't explain how to extract the tarball, if someone wants to compile
    gedit from source, the person hopefully knows that it's needed to
    extract the tarball first (also to be able to read the readme file).
    
    Contributions:
    - Don't duplicate infos from the hacking file.

 README.md | 106 +++++++++++++++++++++-----------------------------------------
 1 file changed, 35 insertions(+), 71 deletions(-)
---
diff --git a/README.md b/README.md
index f13b6a1be..768ce7a46 100644
--- a/README.md
+++ b/README.md
@@ -1,98 +1,62 @@
-General Information
-===================
+gedit - The GNOME text editor
+=============================
 
-This is version 3.33.90 of gedit. gedit is a small and lightweight UTF-8 text
-editor for the GNOME environment.
+This is version 3.33.90 of gedit.
 
-gedit is part of GNOME and uses the latest GTK+ and GNOME libraries.
-Complete GNOME integration is featured, with support for Drag and Drop (DnD) 
-from Nautilus (the GNOME file manager), the use of the GNOME help system,
-the Virtual File System GVfs and the GTK+ print framework.
+gedit is the official text editor of the GNOME desktop environment.
+While aiming at simplicity and ease of use, gedit is a powerful general
+purpose text editor.
 
-gedit uses a Multiple Document Interface (MDI), which lets you edit more than 
-one document at the same time.
+Whether you are writing the next bestseller, programming an innovative
+application, or simply taking some quick notes, gedit will be a reliable
+tool to accomplish your task.
 
-gedit supports most standard editing features, plus several not found in your 
-average text editor (plugins being the most notable of these).
+Its flexible plugin system allows you to tailor the application to your
+needs and adapt it to your workflow.
 
-The gedit core is written in the C language. Thanks to GObject introspection,
-plugins may also be written in other languages, like Vala and Python.
-
-Although new features are always under development, currently gedit has:
-
-* Complete support for UTF-8 text
-* Syntax highlighting
-* Support for editing remote files
-* Search and replace
-* Printing and Print Previewing Support
-* File Revert
-* A complete preferences interface
-* Configurable Plugin system, with optional python support
-
-
-Some of the plugins, packaged and installed with gedit include, among others:
-
-* Word count
-* Spell checker
-* File Browser
-* Automatic snippet expansion
-* Sort
-* Insert Date/Time
-* External Tools
-* Tag list
-
-Other external plugins are also available.
+See the [gedit official website](https://wiki.gnome.org/Apps/Gedit) for
+more information.
 
+License
+-------
 
 gedit is released under the GNU General Public License (GPL) version 2 or
-later, see the file 'COPYING' for more information.
+later, see the file `COPYING` for more information.
 
+Dependencies
+------------
 
-Resources
-=========
-
-* [Official web site](https://wiki.gnome.org/Apps/Gedit)
-* [Latest gedit tarball](https://download.gnome.org/sources/gedit/)
-* [Information about gedit mailing lists](https://mail.gnome.org/mailman/listinfo/gedit-list)
+gedit uses the GTK GUI toolkit.
 
+For a complete list of dependencies, see the file `meson.build` and search
+the section “Dependencies”.
 
 Installation
-============
-
-gedit requires `GTK+ >= 3.22.0`, `GtkSourceView >= 4.0.2` and
-`libpeas >= 1.14.1` libraries. It also has a run-time dependency on an
-icon theme for its icons. If gedit fails to display icons, installing
-GNOME's default adwaita-icon-theme is a simple way of providing them.
-
-`PyGObject 3.0.x` and `gobject-introspection 1.42.0` are required to enable
-python plugins support.
+------------
 
-`gspell >= 0.2.5` is required to enable the spell checking plugin.
+gedit uses the [Meson](https://mesonbuild.com/) build system.
 
 Simple install procedure:
 
 ```
-% tar Jxf gedit-3.33.90.tar.xz                 # unpack the sources
-% cd gedit-3.33.90                             # change to the toplevel directory
-% meson _build                                 # run the `configure' script
-% ninja -C _build                              # build gedit
+$ meson builddir && cd builddir # Build configuration
+$ ninja                         # Build
 [ Become root if necessary ]
-% ninja -C _build install                              # install gedit
+$ ninja install                 # Installation
 ```
 
 How to report bugs
-==================
-
-Bugs should be reported to the [GNOME bug tracking system](https://wiki.gnome.org/Apps/Gedit/ReportingBugs).
+------------------
 
+Please read
+[the wiki page on how to report bugs](https://wiki.gnome.org/Apps/Gedit/ReportingBugs),
+it contains a list of frequently reported bugs and a link to the bug
+tracker.
 
 Contributions
-=============
-
-To contribute changes to the project, please fork the project on [the GNOME gitlab 
instance](https://gitlab.gnome.org/GNOME/gedit) and open a merge request.
-If the change fixes an existing bug, add the issue number in the merge request comment.
-
-See the file 'HACKING' for more detailed information.
+-------------
 
+gedit development relies on voluntary contributions and everyone is invited
+to help.
 
-  The gedit team.
+See the file `HACKING` for more information.