[Minimal build] Reduce file size of minimal build for 1MB OTA

In order to get the build size down, a number of things had to be done:

- Removed notifications
- Reduce favicon.ico size
- Reduce flash string usage
- No SVG images on buttons.

Also made the OTA load button visible but disabled when OTA not possible.

platformio.ini

@@ -181,6 +181,12 @@ build_flags               = ${beta_platform.build_flags}
 [normal_ota]
 platform                  = ${regular_platform.platform}
 build_flags               = ${regular_platform.build_flags} -DPLUGIN_BUILD_MINIMAL_OTA
+board_upload.maximum_size = 616448
+
+[normal_beta_ota]
+platform                  = ${beta_platform.platform}
+build_flags               = ${beta_platform.build_flags} -DPLUGIN_BUILD_MINIMAL_OTA
+board_upload.maximum_size = ${normal_ota.board_upload.maximum_size}
 
 [normal_ir]
 platform                  = ${regular_platform.platform}
@@ -355,7 +361,7 @@ framework                 = ${common.framework}
 upload_speed              = ${common.upload_speed}
 monitor_speed             = ${common.monitor_speed}
 board                     = ${esp8266_1M.board}
-board_upload.maximum_size = 616448
+board_upload.maximum_size = ${normal_ota.board_upload.maximum_size}
 board_build.f_cpu         = ${esp8266_1M.board_build.f_cpu}
 board_build.flash_mode    = ${esp8266_1M.board_build.flash_mode}
 build_unflags             = ${esp8266_1M.build_unflags}
@@ -371,12 +377,43 @@ framework                 = ${common.framework}
 upload_speed              = ${common.upload_speed}
 monitor_speed             = ${common.monitor_speed}
 board                     = ${esp8285_1M.board}
-board_upload.maximum_size = 616448
+board_upload.maximum_size = ${normal_ota.board_upload.maximum_size}
 board_build.f_cpu         = ${esp8285_1M.board_build.f_cpu}
 board_build.flash_mode    = ${esp8285_1M.board_build.flash_mode}
 build_unflags             = ${esp8285_1M.build_unflags}
 build_flags               = ${esp8285_1M.build_flags} ${normal_ota.build_flags}
 
+[env:minimal_core_250_beta_ESP8266_1024_OTA]
+platform                  = ${normal_beta_ota.platform}
+lib_deps                  = ${common.lib_deps}
+lib_ignore                = ${common.lib_ignore}
+lib_ldf_mode              = ${common.lib_ldf_mode}
+lib_archive               = ${common.lib_archive}
+framework                 = ${common.framework}
+upload_speed              = ${common.upload_speed}
+monitor_speed             = ${common.monitor_speed}
+board                     = ${esp8266_1M.board}
+board_upload.maximum_size = ${normal_beta_ota.board_upload.maximum_size}
+board_build.f_cpu         = ${esp8266_1M.board_build.f_cpu}
+board_build.flash_mode    = ${esp8266_1M.board_build.flash_mode}
+build_unflags             = ${esp8266_1M.build_unflags}
+build_flags               = ${esp8266_1M.build_flags} ${normal_beta_ota.build_flags}
+
+[env:minimal_core_250_beta_ESP8285_1024_OTA]
+platform                  = ${normal_beta_ota.platform}
+lib_deps                  = ${common.lib_deps}
+lib_ignore                = ${common.lib_ignore}
+lib_ldf_mode              = ${common.lib_ldf_mode}
+lib_archive               = ${common.lib_archive}
+framework                 = ${common.framework}
+upload_speed              = ${common.upload_speed}
+monitor_speed             = ${common.monitor_speed}
+board                     = ${esp8285_1M.board}
+board_upload.maximum_size = ${normal_beta_ota.board_upload.maximum_size}
+board_build.f_cpu         = ${esp8285_1M.board_build.f_cpu}
+board_build.flash_mode    = ${esp8285_1M.board_build.flash_mode}
+build_unflags             = ${esp8285_1M.build_unflags}
+build_flags               = ${esp8285_1M.build_flags} ${normal_beta_ota.build_flags}
 
 [env:normal_core_241_ESP8266_1024]
 platform                  = ${normal_241.platform}