Replace Sphinx with MkDocs

Breaking changes:

• no need for :class: or :term: statements anymore
• Google docstring style from now on

docs/includes/glossary.md

@@ -3,6 +3,7 @@
 *[BGP]: Border Gateway Protocol
 *[BSS]: Business Support Systems
 *[CFS]: Customer Facing Service
+*[CIDR]: Classless Inter-Domain Routing
 *[DCIM]: Datacenter Infrastructure Manager
 *[DHCP]: Dynamic Host Configuration Protocol
 *[DNS]: Domain Name System
@@ -24,6 +25,7 @@
 *[IS-IS]: Intermediate System to Intermediate System
 *[ISO]: International Standards Organisations
 *[L3VPN]: Layer 3 VPN
+*[LACP]: Link Aggregation Control Protocol
 *[LLDP]: Link-Layer Discovery Protocol
 *[LSO]: Lightweight Service Orchestrator
 *[MAC]: Medium Access Control
@@ -43,4 +45,6 @@
 *[TBA]: To be added
 *[UAT]: User Acceptance Testing
 *[VM]: Virtual Machine
+*[VRF]: Virtual Routing and Forwarding
+*[WAN]: Wide Area Network
 *[WFO]: Workflow Orchestrator