docs: started terminology page

docs/content/_index.md

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 ## Overview
 
 Vieter consists of two main parts, namely an implementation of an Arch
-repository server & a scheduling system to periodically build Pacman packages &
+repository server & an accompanying build system for populating said repository
-publish them to a repository.
+by periodically building packages. Package builds happen in isolated Docker
+containers.
 
 {{< hint info >}}
 **Note**  

docs/content/terminology.md

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+---
+weight: 40
+---
+
+# Terminology
+
+Throughout both the codebase and the documentation, I use a couple of terms
+that might be confusing at first glance. This page aims to explain this
+Vieter-specific jargon.
+
+## Repo & arch-repo
+
+In Pacman jargon, a repository is simply an HTTP(S) web server that provides a
+database archive, and optionally a files archive. This database archive
+contains information about what packages are contained in the repository,
+including the filenames of the actual package tarballs that Pacman then
+downloads when installing and updating packages.
+
+In Vieter, this is called an arch-repository. The reason for this change in
+naming is because Vieter allows packages of different architectures to reside
+under the same repository name. For a Vieter repository named `vieter`, there
+can be packages built for the `x86_64` and the `aarch64` architecture. For both
+of these architectures, a Pacman repository (or arch-repository) is created,
+and it's these architecture-specific repositories that are then accessed by
+Pacman. On either architecture, the repository could then be added to
+`/etc/pacman.conf` as follows:
+
+```
+[vieter]
+Server = https://arch.r8r.be/$repo/$arch
+SigLevel = Optional
+```
+
+## Target
+
+A target describes a build that should be periodically performed. Each target
+consists of a URL to a Git repository containing a PKGBUILD (or a direct URL to
+said PKGBUILD), among various other configuration options. The list of targets
+defines what builds need to be performed at what times, on what architectures.