docs: update dev docs, fix broken links, improve clarity of key points (#2354)

* Dev docs: tests, postgres/psycog2

* Update pull request process.

* Add Food/Unit parsing instructions to the FAQ

* Update docker composes: mealie-data now local to docker-compose rather than hidden in docker volume dir! postgres points to 1.0.0b5

* sqlite docker-compose: mealie-data now local rather than hidden in docker volumes

* Merge Intro FAQ into main FAQ

* Progress on docs

* Add Advanced and v1b5 to docs index

* v1b5 changelog consistency with other changelogs

* Features: fix wrong link, name buttons for clarity

* Migration: link to github releases

* Updating: link to migration page, format docker cmds

* FAQ: update smart ingredient formatting

* Intro: fix typos

* API: update for newbie clarity

* Roadmap: update feature request & progress mechanism

* iOS shortcut: fix broken image links

* installation: add SMTP google app passwords

* Postgres: add header note on why.

* Update Groups doc per Discord discussion

* mealie-data back into docker default volume path

docs/docs/documentation/getting-started/installation/postgres.md

@@ -1,5 +1,7 @@
 # Installing with PostgreSQL
 
+PostgreSQL might be considered if you need to support many concurrent users. In addition, some features are only enabled on PostgreSQL, such as fuzzy search.
+
 **For Environmental Variable Configuration See:**
 
 - [Frontend Configuration](./frontend-config.md)
@@ -10,7 +12,7 @@
 version: "3.7"
 services:
   mealie-frontend:
-    image: hkotel/mealie:frontend-v1.0.0beta-4
+    image: hkotel/mealie:frontend-v1.0.0beta-5
     container_name: mealie-frontend
     depends_on:
       - mealie-api
@@ -23,7 +25,7 @@ services:
     volumes:
       - mealie-data:/app/data/ # (3)
   mealie-api:
-    image: hkotel/mealie:api-v1.0.0beta-4
+    image: hkotel/mealie:api-v1.0.0beta-5
     container_name: mealie-api
     deploy:
       resources:
@@ -56,7 +58,7 @@ services:
     image: postgres
     restart: always
     volumes:
-      - mealie-pgdata:/var/lib/postgresql/data
+      - ./mealie-pgdata:/var/lib/postgresql/data
     environment:
       POSTGRES_PASSWORD: mealie
       POSTGRES_USER: mealie