Self-Hosting on Ubuntu 20.04

; Documentation to set up your own server and web services.
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; Instructions include:
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;    - Setting up basic security
;    - Configuring IPTables
;    - Setting up a full mail server with anti-spam
;    - Setting up a webserver with additional security and web firewall
;    - Setting up Varnish caching system
;    - Configuring Apparmor
;    - Installing a variety of services including Funkwhale, Peertube, and Gitea.
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; These instructions were originally written or compiled to be my own reference.
; Various sources of information were used, all tested and amended or added to where necessary.
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