Concentrate configuration content parsing in syntax::serial

Fixes some pages not having parsed input by making it much harder to
construct a config with unparsed text, which is something you basically
never want. The parsing now happens much earlier and consumers don't
need to remember to parse the configuration anymore.

Fixes a possible stack overflow due to parsing and configuration
depending on each other.

This commit also has dependencies updates and minor justfile tweaks.

src/syntax/content.rs

@@ -1,5 +1,7 @@
 use parser::{token::Token, lexeme::Lexeme};
 
+use crate::types::Config;
+
 pub mod parser;
 
 pub trait Parseable {
@@ -12,6 +14,9 @@ type Probe = fn(&Lexeme) -> bool;
 type Lexer = fn(&Lexeme) -> Token;
 type LexMap<'lm> = &'lm [(Probe, Lexer)];
 
-pub fn parse(text: &str) -> String {
-    parser::read(text)
+pub fn parse(text: &str, config: &Config) -> String {
+    if text.is_empty() {
+        return String::new();
+    }
+    parser::read(text, config)
 }