emacs: get started with emacs literate config

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+This is (will be) my Emacs literate configuration file. A self
+contained file with all my configuration is useful for documentation
+purposes. It will be modeled using the technique described by
+Protesilaos for his own Emacs config file:
+<https://protesilaos.com/emacs/dotemacs>.
+
+This method consists in generating all files /a priori/, after modifying
+this file, and *not* at load time, as that would be too slow.
+
+#+begin_src emacs-lisp :tangle no :results none
+(org-babel-tangle)  
+#+end_src
+
+* Directory and file structure
+
+- =early-init.el=: quoting the [[https://www.gnu.org/software/emacs/manual/html_node/emacs/Early-Init-File.html][Emacs documentation]], this file is "loaded
+  before the package system and GUI is initialized, so in it you can
+  customize variables that affect the package initialization process"
+- =init.el=: the skeleton of my configuration framework. It will load
+  the rest of the modules.
+- =rul-emacs-modules/=: a directory with Emacs modules specific to my
+  configuration. Modules group code related to a topic or theme of
+  configuration. For example, =rul-prog.el= contains code related to
+  programming, and =rul-org.el= contains code related to org-mode. If a
+  module gets too big, I can create a smaller module under the same
+  topic; for example, =rul-org-agenda.el=.
+- =rul-post-init.el=: this file will be loaded after =init.el=, and will
+  normally live in other git repository. Here I normally add overrides
+  needed in my work computer.
+- =rul-emacs.org=: this file. It (will) generate the rest of the structure.
+
+* The early init
+
+** Graphical aspects
+Customization of graphical aspects of Emacs, such as size, panels, etc.
+
+#+begin_src emacs-lisp :tangle "early-init.el"
+;; I don't use any of these
+(menu-bar-mode -1)
+(tool-bar-mode -1)
+(scroll-bar-mode -1)
+
+;; Avoid initial flash of light.
+;; Inspired on prot-emacs-avoid-initial-flash-of-light.
+(setq mode-line-format nil)
+(set-face-attribute 'default nil :background "#000000" :foreground "#ffffff")
+(set-face-attribute 'mode-line nil :background "#000000" :foreground "#ffffff" :box 'unspecified)
+#+end_src
+ 
+** Frame configuration
+I like to keep a few frames open all the time. A main frame, where I
+open my org files, code, etc. A frame for communication and reading,
+such as email and feeds, and a frame for terminals.
+
+Currently, the frames are all the same, but I will add configuration
+to distinguish them so I can automate their placement in my desktop
+environment.
+
+#+begin_src emacs-lisp :tangle "early-init.el"
+;; Do not resize when font size changes
+(setq frame-resize-pixelwise t)
+
+;; By default, start maximized
+(add-to-list 'default-frame-alist '(fullscreen . maximized))
+
+;; No need for titlebar
+(modify-frame-parameters nil '((undecorated . t)))
+#+end_src
+
+** Miscellany
+#+begin_src emacs-lisp :tangle "early-init.el"
+;; Initialise installed packages, otherwise, basic functions are not
+;; available during the initialization stage.
+(setq package-enable-at-startup t)
+
+;; Do not report warnings. It's too noisy.
+(setq native-comp-async-report-warnings-errors 'silent)
+#+end_src
+
+
+