general: Reformat documentation with better formatting and wording

General purpose reformating and rewording in (a few places). This should
also make markdown linting happier.

Prefer back-ticks wherever useful and use `console` for code blocks to
be executed on terminal.

Also, update references links wherever possible (including update from
'http://' to 'https://').

modules/emacs/README.md

@@ -1,10 +1,8 @@
-Emacs
-=====
+# Emacs
 
 Enables Emacs dependency management.
 
-Dependency management
----------------------
+## Dependency management
 
 [Carton][1] installs and manages Emacs packages for Emacs package development
 and Emacs configuration.
@@ -12,22 +10,20 @@ and Emacs configuration.
 This module prepends the Carton directory to the path variable to enable the
 execution of `carton`.
 
-Aliases
--------
+## Aliases
 
 ### Carton
 
-  - `cai` installs dependencies.
-  - `cau` updates dependencies.
-  - `caI` initializes the current directory for dependency management.
-  - `cae` executes a command which correct dependencies.
+- `cai` installs dependencies.
+- `cau` updates dependencies.
+- `caI` initializes the current directory for dependency management.
+- `cae` executes a command which correct dependencies.
 
-Authors
--------
+## Authors
 
 *The authors of this module should be contacted via the [issue tracker][2].*
 
-  - [Sebastian Wiesner](https://github.com/lunaryorn)
+- [Sebastian Wiesner](https://github.com/lunaryorn)
 
 [1]: https://github.com/rejeep/carton
 [2]: https://github.com/sorin-ionescu/prezto/issues