docs: add syntax highlighting to code blocks

docs/bin.md

@@ -76,7 +76,7 @@ For parameter formats check said section in the script (Bash syntax).
 
 An example params file:
 
-```
+```bash
 # Let's have bit longer tests
 test_run_time_quick=20
 # Run only one deep memory benchmark
@@ -203,15 +203,15 @@ After signing they can be loaded with `modprobe`.
 For this you need a MOK key and certificate and it needs to be enrolled in EFI:
 
 1. Generate MOK key
-    ```
+    ```bash
     openssl genpkey -algorithm rsa -out MOK_KEY
     ```
 1. Create MOK certificate
-    ```
+    ```bash
     openssl req -new -x509 -key MOK_KEY -outform DER -out MOK_CERT
     ```
 1. Enroll MOK certificate
-    ```
+    ```bash
     mokutil --import MOK_CERT
     ```
 1. Reboot and perform enrolling
@@ -248,7 +248,7 @@ Useful if you need to send a string to some application, but it can receive that
 
 Example:
 
-```
+```bash
 export ECHO_WRAP=password
 export SSH_ASKPASS=/path/to/wrecho
 ssh-add SSH_KEY </dev/null

docs/install.md

@@ -14,15 +14,15 @@ For detailed instructions on using the loader check [Reference](lib/_loader.md).
 **Installation steps**
 
 1. Clone Git repository
-    ```
+    ```bash
     git clone https://github.com/es-progress/shell.git SHELL_DIR
     ```
 1. Set `ES_SHELL_LOADER` to point to `lib/_loader.sh`. Best to put this in your `.bashrc`.
-    ```
+    ```bash
     export ES_SHELL_LOADER="SHELL_DIR/lib/_loader.sh"
     ```
 1. (Optional) Add `bin` to your `PATH` so you can run scripts just by name
-    ```
+    ```bash
     PATH="SHELL_DIR/bin:${PATH}"
     ```
 

docs/lib/_loader.md

@@ -5,7 +5,7 @@ Basically, you need to source this file in any script where you want to use libr
 
 **Usage in scripts**
 
-```
+```bash
 # Source loader
 . /path/to/shell/lib/_loader.sh
 
@@ -20,7 +20,7 @@ error-exit "Nothing to do"
 If you do the envvar way, you need to set `/path/to/shell/lib/_loader.sh` in `ES_SHELL_LOADER`.
 You can do this in `.bashrc` or just when running a script:
 
-```
+```bash
 ES_SHELL_LOADER=/path/to/lib/_loader.sh backup
 ```
 

docs/lib/error.md

@@ -16,7 +16,7 @@ _E_NO_CHANGE       Report no change. This can be used for idempotent scripts.
 
 **Usage**
 
-```
+```bash
 exit "${_E_ABORT}"
 ```
 

docs/lib/text.md

@@ -46,7 +46,7 @@ Content inside sections are returned unparsed, so format is up to you (square br
 
 Config file example:
 
-```
+```ini
 # This is a comment
 
   # Whitespace allowed before comments

docs/lib/ui.md

@@ -34,7 +34,7 @@ TXT_NORM           Clear all formatting.
 
 **Usage**
 
-```
+```bash
 echo -e "${TXT_BOLD}${TXT_YELLOW}I'm in bold yellow${TXT_NORM} This is unformatted text"
 ```
 
@@ -100,7 +100,7 @@ MESSAGE            Message to print, default: "Done."
 
 ## print-header
 
-Print header: text with yellow font-color after a new-line.
+Print header: text with yellow font-color on its own line.
 
 **Usage**