docs: Update website (#288)

* Create WebsiteInstructions.md

* Update index.markdown

docs/WebsiteInstructions.md

@@ -0,0 +1,19 @@
+
+# HepLean website
+
+The HepLean website is made using [Jeykll](https://jekyllrb.com) and is generated via the workflow
+`./.github/docs.yml`.
+
+## Hosting the website locally
+
+The installation instructions for jekyll can be found [here](https://jekyllrb.com/docs/installation/#requirements).
+
+Once jekyll is installed:
+- navigate your terminal to the `./docs` directory of HepLean using e.g. `cd ./docs`.
+- Run `bundle exec jekyll serve`
+- Open `http://localhost:4000` in your webbrowser.
+
+## HepLean domain
+
+The HepLean website is hosted at `https://heplean.com`. This domain is registered via
+squarespace domains by Joseph Tooby-Smith.

docs/index.markdown

@@ -9,16 +9,28 @@
 
 # What is HepLean?
 
-HepLean is an open-source project to digitalise definitions, theorems, proofs, and calculations in high energy physics using the interactive theorem prover Lean 4.
+HepLean is an open-source project to digitalise definitions, theorems, proofs, and calculations in physics using the interactive theorem prover Lean 4.
 
-HepLean has the potential to benefit the high energy physics community in four ways:
+## Scope of HepLean
+
+Currently the scope of HepLean includes the results and foundations of the following arXiv categories:
+
+*hep-th, hep-ph, hep-ex, hep-lat, gr-qc, and math-ph.*
+
+In particular, the current scope of HepLean includes (but is not limited to) the following foundational areas:
+
+*special and general relativity, quantum mechanics, quantum field theory, particle physics, classical mechanics and field theory, cosmology, thermodynamics*
+
+Once the foundations are in place, and HepLean has a large enough active community behind it, the scope of HepLean will naturally increase to include other areas of physics (and it most likely will undergo a name change).
+
+# Why formalize physics?
+
+HepLean has the potential to benefit the physics community in four ways:
 - Make it easier to find results.
 - Make it easier to automate the creation of new results using e.g. machine learning methods.
 - Make it easier to check papers and results for mathematical correctness.
-- Create new avenues through which high energy physics can be taught.
-
-HepLean is a connection between high energy physics (both formal and phenomenological),
-computer science, and mathematics.
+- Create new avenues through which physics can be taught.
+- Opens up new ways to interface between theory and computer programs.
 
 # How to get involved?