feat: ask for donations during december

Recently KDE just did a really good fundraiser by asking for donations
using a one-time notification which they plan on having once every
December. In future this should likely be moved directly to the Termux
app. Donation requests can be made during year end and when new major
releases are made. Also, we are probably late, but probably not very
late :)

Currently motd.sh.in has the logic encoded within to only ask for
donations in December, but the static motd file can't hold any such
logic. So this file needs to be reverted back to it's original form
after December.

KDE fundraiser: https://kde.org/fundraisers/yearend2024/

motds/motd

@@ -0,0 +1,15 @@
+Welcome to Termux!
+
+Docs:       https://termux.dev/docs
+Donate:     https://termux.dev/donate
+Community:  https://termux.dev/community
+
+Working with packages:
+
+ - Search:  pkg search <query>
+ - Install: pkg install <package>
+ - Upgrade: pkg upgrade
+
+Report issues at https://termux.dev/issues
+Termux needs your help! Donations help fund development and infrastructure import for Termux's continued existence
+Consider donating at https://termux.dev/en/donate

motds/motd.sh.in

@@ -24,8 +24,12 @@ else
 \e[1mWelcome to Termux!\e[0m
 
 \e[1mDocs:\e[0m      \e[4mhttps://termux.dev/docs\e[0m
-\e[1mDonate:\e[0m    \e[4mhttps://termux.dev/donate\e[0m
-\e[1mCommunity:\e[0m \e[4mhttps://termux.dev/community\e[0m
+"
+    if [ "$(date +%m)" != "12" ]; then
+        motd+="\e[1mDonate:\e[0m    \e[4mhttps://termux.dev/donate\e[0m
+"
+    fi
+    motd+="\e[1mCommunity:\e[0m \e[4mhttps://termux.dev/community\e[0m
 
 \e[1mTermux version:\e[0m ${TERMUX_VERSION-Unknown}
 "
@@ -58,4 +62,13 @@ motd+="
 ${motd_indent}Report issues at \e[4mhttps://termux.dev/issues\e[0m
 "
 
+if [ "$(date +%m)" = "12" ]; then
+
+    motd+="
+\e[1m\e[31mTermux needs your help! Donations help fund development and infrastructure import for Termux's continued existence\e[0m
+\e[1mConsider donating at \e[34mhttps://termux.dev/en/donate\e[0m
+"
+
+fi
+
 echo -e "$motd"