Render the book in PDF using pandoc and LaTeX. (#126)

* Render the book in PDF using `pandoc` and LaTeX.

* Fix installs.

* Go the apt-get route

* Another attempt

* Avoid installing twice.

* Re-order.

* Add more packages.

* Minimise deps. Fix link checker.

* Missing package.

* Missing package.

* Missing package.

* More packages.

* Missing package.

* Missing package.

* More packages...

* Remove.

* Fix link checker.

* Fix link checker.

* Fix path.

* Add subtitle.

* Avoid running over the right margin.

* Avoid running over the right margin.

* Formatting

book/src/03_ticket_v1/01_struct.md

@@ -48,7 +48,7 @@ You can create an instance of a struct by specifying the values for each field:
 // Syntax: <StructName> { <field_name>: <value>, ... }
 let ticket = Ticket {
     title: "Build a ticket system".into(),
-    description: "Create a system that can manage tickets across a Kanban board".into(),
+    description: "A Kanban board".into(),
     status: "Open".into()
 };
 ```
@@ -130,7 +130,8 @@ let default_config = Configuration::default();
 You can use the function call syntax even for methods that take `self` as their first parameter:
 
 ```rust
-// Function call syntax: <StructName>::<method_name>(<instance>, <parameters>)
+// Function call syntax:
+//   <StructName>::<method_name>(<instance>, <parameters>)
 let is_open = Ticket::is_open(ticket);
 ```
 

book/src/03_ticket_v1/03_modules.md

@@ -81,7 +81,7 @@ You have to use a **path** pointing to the entity you want to access.
 
 You can compose the path in various ways:
 
-- starting from the root of the current crate, e.g. `crate::module_1::module_2::MyStruct`
+- starting from the root of the current crate, e.g. `crate::module_1::MyStruct`
 - starting from the parent module, e.g. `super::my_function`
 - starting from the current module, e.g. `sub_module_1::MyStruct`
 

book/src/03_ticket_v1/05_encapsulation.md

@@ -30,7 +30,7 @@ instantiation syntax:
 // This won't work!
 let ticket = Ticket {
     title: "Build a ticket system".into(),
-    description: "Create a system that can manage tickets across a Kanban board".into(),
+    description: "A Kanban board".into(),
     status: "Open".into()
 };
 ```

book/src/03_ticket_v1/06_ownership.md

@@ -44,9 +44,11 @@ error[E0382]: use of moved value: `ticket`
    |               -------- `ticket` moved due to this method call
 ...
 30 |         println!("Your next task is: {}", ticket.title());
-   |                                           ^^^^^^ value used here after move
+   |                                           ^^^^^^ 
+   |                                value used here after move
    |
-note: `Ticket::status` takes ownership of the receiver `self`, which moves `ticket`
+note: `Ticket::status` takes ownership of the receiver `self`, 
+      which moves `ticket`
   --> src/main.rs:12:23
    |
 12 |         pub fn status(self) -> String {
@@ -130,9 +132,11 @@ error[E0382]: use of moved value: `ticket`
    |               -------- `ticket` moved due to this method call
 ...
 30 |         println!("Your next task is: {}", ticket.title());
-   |                                           ^^^^^^ value used here after move
+   |                                           ^^^^^^ 
+   |                                 value used here after move
    |
-note: `Ticket::status` takes ownership of the receiver `self`, which moves `ticket`
+note: `Ticket::status` takes ownership of the receiver `self`, 
+      which moves `ticket`
   --> src/main.rs:12:23
    |
 12 |         pub fn status(self) -> String {
@@ -199,8 +203,10 @@ fn main() {
         active: true,
     };
     // `b` is a reference to the `version` field of `config`.
-    // The type of `b` is `&u32`, since it contains a reference to a `u32` value.
-    // We create a reference by borrowing `config.version`, using the `&` operator.
+    // The type of `b` is `&u32`, since it contains a reference to 
+    // a `u32` value.
+    // We create a reference by borrowing `config.version`, using 
+    // the `&` operator.
     // Same symbol (`&`), different meaning depending on the context!
     let b: &u32 = &config.version;
     //     ^ The type annotation is not necessary, 

book/src/03_ticket_v1/07_setters.md

@@ -50,7 +50,11 @@ It takes ownership of `self`, changes the title, and returns the modified `Ticke
 This is how you'd use it:
 
 ```rust
-let ticket = Ticket::new("Title".into(), "Description".into(), "To-Do".into());
+let ticket = Ticket::new(
+    "Title".into(), 
+    "Description".into(), 
+    "To-Do".into()
+);
 let ticket = ticket.set_title("New title".into());
 ```
 
@@ -88,7 +92,11 @@ Nothing is returned.
 You'd use it like this:
 
 ```rust
-let mut ticket = Ticket::new("Title".into(), "Description".into(), "To-Do".into());
+let mut ticket = Ticket::new(
+    "Title".into(),
+    "Description".into(),
+    "To-Do".into()
+);
 ticket.set_title("New title".into());
 
 // Use the modified ticket

book/src/03_ticket_v1/08_stack.md

@@ -18,11 +18,25 @@ the function's arguments, local variables and a few "bookkeeping" values.\
 When the function returns, the stack frame is popped off the stack[^stack-overflow].
 
 ```text
-                                 +-----------------+
-                       func2     | frame for func2 |   func2
-+-----------------+  is called   +-----------------+  returns   +-----------------+
-| frame for func1 | -----------> | frame for func1 | ---------> | frame for func1 |
-+-----------------+              +-----------------+            +-----------------+
++-----------------+
+| frame for func1 |
++-----------------+
+        |
+        | func2 is 
+        | called
+        v
++-----------------+
+| frame for func2 |
++-----------------+
+| frame for func1 |
++-----------------+
+        |
+        | func2  
+        | returns
+        v
++-----------------+
+| frame for func1 |
++-----------------+
 ```
 
 From an operational point of view, stack allocation/de-allocation is **very fast**.\