update: Add criteria to VPN Services page and update other sections (#2788)

Updates include:
- Obfuscation info, ProtonVPN IPv6 and added missing download links
- added a few criteria

Testing:
- Proton has IPv6 support on Linux but it didn't work for me
- Requirements for FDE/ram servers make sense to prevent logging by malicious employees.
- Mullvad/IVPN are ram-only while Proton has FDE.
- Requirements for the jurisdiction is to prevent cases like RiseupVPN (https://riseup.net/en/about-us/press/canary-statement).

Co-authored-by: redoomed1 <161974310+redoomed1@users.noreply.github.com>
Co-authored-by: fria <138676274+friadev@users.noreply.github.com>
Signed-off-by: Daniel Gray <dngray@privacyguides.org>

includes/abbreviations.en.txt

@@ -16,6 +16,7 @@
 *[DoQ]: DNS over QUIC
 *[DoH3]: DNS over HTTP/3
 *[DoT]: DNS over TLS
+*[DPI]: Deep Packet Inspection identifies and blocks packet with specific payloads
 *[E2EE]: End-to-End Encryption/Encrypted
 *[ECS]: EDNS Client Subnet
 *[EEA]: European Economic Area
@@ -71,6 +72,7 @@
 *[PGP]: Pretty Good Privacy (see OpenPGP)
 *[PII]: Personally Identifiable Information
 *[QNAME]: Qualified Name
+*[QUIC]: A network protocol based on UDP, but aiming to combine the speed of UDP with the reliability of TCP.
 *[rolling release]: Updates which are released frequently rather than set intervals
 *[RSS]: Really Simple Syndication
 *[SELinux]: Security-Enhanced Linux