Add "Extra Requirements" to Intro

config.org

@@ -41,6 +41,27 @@ externally setup (i.e. outside of this config).
 + uni-units file :: I've got a file in =~/.org/.uni-units= which I use in ~org-capture~
   If this causes issues, just remove the reference to that file in [[*Capture][Capture]] and
   instances of ~unit-prompt~ used in ~(doct ...)~
+*** Extra Requirements
+The lovely ~doom doctor~ is good at diagnosing most missing things, but here are a
+few extras.
++ A [[https://www.tug.org/texlive/][LaTeX Compiler]] is required for the mathematics rendering performed in [[#org][Org]],
+  and by [[*CalcTeX][CalcTeX]].
++ I use the [[https://overpassfont.org/][Overpass]] font as a go-to sans serif.
+  It's used as my ~doom-variable-pitch-font~ and in the graph generated by [[*Roam][Roam]].
+  I have chosen it because it possesses a few characteristics I consider
+  desirable, namely:
+  - A clean, and legible style. Highway-style fonts tend to be designed to be
+    clear at a glance, and work well with a thicker weight, and this is inspired
+    by /Highway Gothic/.
+  - It's slightly quirky. Look at the diagonal cut on stems for example.
+    Helvetica is a masterful design, but I like a bit more pizazz now and then.
++ A few LSP servers. Take a look at [[file:init.el][init.el]] to see which modules have the ~+lsp~ flag.
++ The =cargo-script= rust crate is required for evaluation of rust blocks by babel.
+  As described in the README for [[https://github.com/micanzhang/ob-rust][ob-rust]]. Like ~delta~, this can just be installed
+  using cargo.
+  #+BEGIN_SRC shell
+cargo install cargo-script
+  #+END_SRC
 * Rudimentary configuration
 Make this file run (slightly) faster with lexical binding (see [[https://nullprogram.com/blog/2016/12/22/][this blog post]]
 for more info).
@@ -882,6 +903,9 @@ It's nice to see ansi colour codes displayed
       (ansi-color-apply-on-region (point-min) (point-max)))))
 #+END_SRC
 ** Org Mode
+:PROPERTIES:
+:CUSTOM_ID: org
+:END:
 *** System config
 Org mode isn't recognised as it's own mime type by default, but that can easily
 be changed with the following file. For system-wide changes try