Minor additions to the documentation (#975)

* added more references to gef-extras

* adding a note about required common bins (issue #973)

* applied `markdownlint`

* manual markdownl formatting

README.md

@@ -61,6 +61,8 @@ d more comprehensible layout to GDB Python API.
 * Built around an architecture abstraction layer, so all commands work in any GDB-supported
   architecture such as x86-32/64, ARMv5/6/7, AARCH64, SPARC, MIPS, PowerPC, etc.
 * Suited for real-life apps debugging, exploit development, just as much as CTF
+* And a lot more commands contributed by the community available on 
+  [GEF-Extras](https://github.com/hugsy/gef-extras) !!
 
 Check out the [Screenshot page](docs/screenshots.md) for more or [try it
 online](https://demo.gef.blah.cat) (user:`gef`/password:`gef-demo`)

docs/index.md

@@ -29,6 +29,7 @@ It requires Python 3, but [`gef-legacy`](https://github.com/hugsy/gef-legacy) ca
 * Built around an architecture abstraction layer, so all commands work in any GDB-supported
   architecture such as x86-32/64, ARMv5/6/7, AARCH64, SPARC, MIPS, PowerPC, etc.
 * Suited for real-life debugging, exploit development, just as much as for CTFs
+* And a lot more commands contributed by the community available on [GEF-Extras](https://github.com/hugsy/gef-extras) !!
 
 Check out the [showroom page](https://hugsy.github.io/gef/screenshots/) for more | or [try it online
 yourself!](https://demo.gef.blah.cat) (user:`gef`/password:`gef-demo`)

docs/install.md

@@ -2,6 +2,14 @@
 
 ## Prerequisites
 
+Specific GEF commands rely on commonly used Unix commands to extract additional information. Therefore it requires the following binaries to be present:
+  * `file`
+  * `readelf`
+  * `ps`
+  * `python3`
+
+Those tools are included by default in many modern distributions. If they're missing, you can use your OS package manager to install them.
+
 ### GDB
 
 Only [GDB 8 and higher](https://www.gnu.org/s/gdb) is required. It must be compiled with Python 3.6

mkdocs.yml

@@ -11,7 +11,6 @@ theme:
 
 nav:
 - Home: index.md
-- Coverage: https://hugsy.github.io/gef/coverage/
 - Showroom: screenshots.md
 - Setup:
   - Installation: install.md
@@ -22,6 +21,7 @@ nav:
   - Testing: testing.md
   - Write extensions: api.md
   - API: api/gef.md
+  - Coverage: https://hugsy.github.io/gef/coverage/
 - Commands:
   - aliases: commands/aliases.md
   - aslr: commands/aslr.md
@@ -76,4 +76,5 @@ nav:
   - got: functions/got.md
   - heap: functions/heap.md
   - stack: functions/stack.md
+- GEF-Extras: https://hugsy.github.io/gef-extras/
 - Deprecated: deprecated.md