Update configuration path from .conf to config

Amolith created 

Renamed the configuration file from ~/.config/xmppc.conf to
~/.config/xmppc/config in both source and documentation.

Signed-off-by: Amolith <amolith@secluded.site>

Change summary

README.md  | 6 +++---
src/main.c | 6 +++---
2 files changed, 6 insertions(+), 6 deletions(-)

Detailed changes

README.md 🔗 

@@ -46,7 +46,7 @@ mv xmppc ~/.local/bin/xmppc
 
 ## Files
 
-- `~/.config/xmppc.conf` — account configuration.
+- `~/.config/xmppc/config` — account configuration.
 - `~/.config/xmppc/AGENTS.md` — optional instructions for LLM agents using
   `xmppc`.
 
@@ -66,7 +66,7 @@ pass show xmpp/example | xmppc --jid user@example.net --pwd - --mode roster list
 ```
 
 Named accounts are probably nicer. `xmppc` reads them from
-`~/.config/xmppc.conf`; the `[default]` account is used when neither `--account`
+`~/.config/xmppc/config`; the `[default]` account is used when neither `--account`
 nor `--jid` is provided.
 
 ```ini
@@ -259,7 +259,7 @@ xmppc agent-skill
 
 It prints an agent skill they should follow, the MAM cursor rules, and explains
 that agents should read `~/.config/xmppc/AGENTS.md` when it exists for
-user-local instructions, but must not read `~/.config/xmppc.conf`.
+user-local instructions, but must not read `~/.config/xmppc/config`.
 
 To install a proper agent skill that points back to the one embedded in your
 binary, run:

src/main.c 🔗 

@@ -436,7 +436,7 @@ int main(int argc, char *argv[]) {
   // Loading config file
   config_file = g_key_file_new();
   configfile = g_string_new( g_get_home_dir());
-  g_string_append(configfile,"/.config/xmppc.conf");
+  g_string_append(configfile,"/.config/xmppc/config");
   gboolean configfilefound = g_key_file_load_from_file(
     config_file,
     configfile->str,
@@ -584,7 +584,7 @@ static int _agent_skill_command(int argc, char *argv[]) {
   const char *skill_text =
     "Before sending or receiving, read ~/.config/xmppc/AGENTS.md if it exists; it\n"
     "contains the user's allowed accounts, preferred contacts, and local policy.\n"
-    "Never read, print, or expose ~/.config/xmppc.conf.\n"
+    "Never read, print, or expose ~/.config/xmppc/config.\n"
     "\n"
     "Commands:\n"
     "  xmppc -a <account> -m message chat <jid> <body>\n"
@@ -636,7 +636,7 @@ static int _agent_skill_command(int argc, char *argv[]) {
     "For installing or updating xmppc itself, see `references/installation.md`.\n";
 
   const char *installation_doc =
-    "Do not print secrets, password commands, or `~/.config/xmppc.conf` while\n"
+    "Do not print secrets, password commands, or `~/.config/xmppc/config` while\n"
     "installing or testing. Runtime account policy belongs in\n"
     "`~/.config/xmppc/AGENTS.md`.\n"
     "\n"