Moves guides from wordpress to the wiki

[matu3ba]

Being finished on the FAQ, the following guidelines are currently on the website:

1. Sandboxing guide
2. Linux capabilities guide
3. Seccomp guide
4. X11 guide

The following examples of functionality/use cases are described:

1. Firejail Usage [very detailed]
2. AppImage Support [brief and nice]
3. Building Whitelisted Profiles
4. ?grsecurity? [meh]

The following guidelines are mentioned in the Issues:

1. server Unable to run a C executable in firejail: Permission denied error. #1521
2. cgroup Limit the memory size used by the jailed process #593
3. wlan interfaces Is there a recommended workaround for using wlan interfaces with firejail? #1600, ip tables filter
4. strace Improved strace syscall editing instructions #404
5. Xephyr ??? Odd behaviour with --x11=xorg under GNOME 3 / gdm #1652

What do you think which guidelines are most important?
What should be moved to the github wiki and what should stay on the website?
(sorry for updating this comment)